Flowstone Channeler
The +1/-1 reads as a pump, but the toughness reduction is the working half: aimed at a one-toughness creature it is removal, aimed at your own attacker it trades a card for a haste-enabled extra point of power. Haste is the fusion that lets those two functions coexist, sending a freshly cast threat into combat the turn it lands while the discard cost feeds whatever wants cards in the bin: a graveyard payoff, a madness trigger, a hand you would rather empty than hold. That is the Spellshaper bargain at work. Each activation costs a card, the untap step, and the mana, so the engine only earns its keep in a deck where discarding is sequencing rather than sacrifice. Build it that way and you have a repeatable converter, a way to keep wringing relevance out of a hand running dry, turning dead draws into either a small board swing or a dead creature. The 2/2 body caps the math: with no evasion and no reach past its own toggleable +1, it attacks into the same small creatures its ability can shrink, and combat was never the point. The card belongs to a strain of red enablers that recast the hand as fuel rather than answers, paying out only for pilots already committed to spending it.
