Infernal Reckoning

The target restriction is the entire design: colorless creatures only, which in practice means Eldrazi, artifact creatures, and the odd construct or colorless token. That narrowness is what buys the rate. This is a hate card, not general removal, and the color-hosing is deliberate: it trades flexibility for absurd efficiency against one kind of threat, the way certain sweepers exist only to punish a single tribe. Exile rather than destroy is the load-bearing verb. The creatures worth pointing this at are precisely the ones ordinary removal cannot keep down: the Eldrazi that shuffle themselves back into the library when they hit a graveyard, the artifact bodies built to recur from the yard. Exile denies the death trigger and strips those bodies from the game entirely, and the incidental lifegain answers colorless aggression at both ends: it removes the threat and offsets whatever damage already landed, all at instant speed for a single mana. The cost of that focus is total. Against a board with no colorless creatures, it is a dead card in hand, worthless the moment the opponent is running a normal colored deck. That binary is the point, not a flaw to apologize for. It belongs to the lineage of narrow color-hate answers built to be devastating against exactly one archetype and inert against everything else: the deliberate opposite of the flexible catch-all removal that shares its cost.