Henchbots

Four mana for exile reads expensive next to Stomped by the Foot and Bot Bashing Time, which both clear threats for two or three. The tap clause is the reason: this is not removal you cast to answer a problem, it is a tax on creatures that have already committed. It cannot touch Shredder, Unrelenting the turn it lands, only the attacker that swung last turn or the body an opponent tapped to push a Sneak trigger.

That punish axis is more relevant in TMT than it would be almost anywhere else. Sneak shows up on 59 cards, so opponents are constantly tapping creatures to push damage or fire abilities, and Henchbots converts those lines into a clean tempo swing. The 2/3 body holds up too: it trades evenly with the format's 3/2s and blocks the 2/2s without dying, so a dead exile clause does not leave you with an embarrassing card.

The seats that want it are the colorless-leaning builds short on white or black removal. UR Sneak shells need a catch-up answer to a threat that has stuck, and any deck splashing through a TCRI Building or Foot Headquarters wants a colorless insurance card that does not strain the mana. P1P7 to P1P9 in those seats, later in colors already holding Stomped by the Foot at common.

Maindeck one, sideboard the second. The failure mode is drawing it into a board of untapped blockers with no combat coming, where it does nothing but sit as a 2/3. In a slower deck without removal density, that risk is acceptable; in a Boros tempo seat with real two-mana answers, it is not.

Colorless exile-on-a-body for Commander decks that want to remove a creature without splashing white, filling the slot Meteor Golem and Duplicant occupy. The tap clause makes it a combat punish rather than proactive removal: it answers attackers and creatures that have tapped for an ability, but it cannot touch an untapped board. When the condition is met the rate beats both, but Duplicant fires regardless of timing, and in a singleton format that flexibility is worth more than the mana saved. Goes in colorless or low-white artifact builds as exile redundancy; Duplicant comes first.

The colorless removal slot in Eldrazi decks, where the incumbent for unconditional creature removal has long been some split of Dismember and the occasional Karn, the Great Creator fetch for a Walking Ballista or similar. Four mana for a 2/3 that exiles only a tapped creature is not in that conversation. The tap restriction is the whole problem in Modern: the format's threats either kill you before they ever tap to attack into open mana, or they belong to decks that win without attacking at all. Henchbots cannot answer Ragavan on the play, cannot touch a Murktide Regent until it has already swung, and does nothing against a combo line that never enters the red zone.

What it asks for is a deck that wants a four-mana colorless body whose removal is contingent on the opponent committing to combat first. Modern does not run that deck. The closest historical analog is something like Meteor Golem in a colorless ramp shell, and that shell is not contesting tables in current Modern either. The Eldrazi decks that do show up want their colorless slots spent on threats and Karn packages, not on a conditional Banisher Priest that leaks its exiled creature back the moment it dies.

Legal, but yet to register in tracked tournament play this season, and the structural read explains why: a removal spell that cannot remove the things actually killing you in Modern is not removal. No active home.

Colorless removal-on-a-body for Standard decks that want a white-style exile effect without the white, leaning on the set's robot subtheme to fill out a midrange artifact shell. The tap restriction makes it a combat punish rather than a clean answer, so it sits below the white versions on rate and timing both. Legal but yet to register in tracked play this season, and the conditional clause is why: four mana for a 2/3 that can only exile a creature already committed to combat is too slow for the decks that would want the effect.

Released this season, Henchbots is legal in Pioneer but has yet to register in tracked tournament play. The structural read explains why. At four mana for a 2/3 with a conditional exile clause, it asks for a deck that wants colorless removal stapled to an artifact body, and the timing restriction makes it worse than what Pioneer's existing decks already run.

The white versions of this effect do the proactive work Henchbots cannot. Skyclave Apparition answers a threat the turn it lands and sits at three mana; Banisher Priest does the same at the same cost. Any deck that can cast white is already covered, and most of Pioneer's white archetypes (Mono-White Humans, Azorius Spirits) are built around cheaper, faster bodies than a four-mana 2/3 that only removes a creature already committed to combat.

The case for colorless removal exists in artifact-heavy or colorless ramp shells, where the historical options were Meteor Golem and Duplicant. But Pioneer does not currently field a tournament deck built around that axis. The robot typing points at a mech subtheme that has no established home in the format's archetype map.

There is no slot conversation here because there is no slot. The decks that want exile-on-a-body run white and run it cheaper; the decks that want colorless removal are not in the format. Henchbots needs an artifact-aggro or colorless-midrange shell that Pioneer's current map does not contain, and the tap requirement keeps it from sliding into anything as flexible interaction.

A 4-mana 2/3 that exiles a tapped creature in a format where unconditional removal costs zero (Lotus into a Mox-fueled answer) and where the relevant threats are Workshop artifacts and Bazaar's graveyard, not attacking creatures you can punish. The tapped-only clause means it cannot answer anything on the turn it lands, and it pays Mental Misstep's neighbors all the way up at four mana with a body that dies to everything. Legal, but yet to register in tracked Vintage play. Noise.

A four-mana 2/3 whose removal is conditioned on the target already being tapped. Swords to Plowshares answers any creature for one mana at instant speed with no timing gate; that is the bar in Legacy, and it is not close. The conditional clause makes Henchbots worse than even the white exile bodies it descends from, since it cannot interact with a threat the turn it lands. Anything at four mana is paying the Force of Will tax, and a punish-for-attacking effect on a 2/3 is not worth the pitch to protect. Legal, but yet to register in tracked tournament play. Does not clear the bar.