Lifecrafter's Gift

A counters payoff masquerading as a pump spell. The first clause is mandatory: it seeds a +1/+1 counter onto its target, and that seeding is the whole hinge. Point it at a lone creature carrying no counters and you net two on that one body, because the second clause then sees a creature with a counter and adds another. That is four mana for a +2/+2, a thin rate. Aim it at a battlefield where three or four creatures already carry counters and the second clause stacks growth across the whole team at once, which is where the card stops being filler and starts ending games. Because it requires a target, it is also exposed: if that single creature leaves before resolution or otherwise becomes an illegal target, the spell fizzles entirely and the untargeted second clause never happens, so you can lose the team-wide payoff to a well-timed removal spell. The instant timing carries the upside. It lets the snowball break mid-combat after blocks are declared, or fire in response to a sweeper to push survivors out of burn range. It belongs in a deck that manufactures counters as a byproduct: proliferate engines, modular and graft creatures, anything that walks in with a counter already attached. The tension is entirely front-loaded; it pays the player who arrived with a counters board and offers almost nothing to the one trying to make this single card do the building.