Slinking Skirge

The body that cantrips. Plenty of early-era creatures turned into resources when they left the board, and this one wears that idea plainly: a flier that flips into a card the moment it stops being useful in the air. The sacrifice cost lives on the creature itself, which is the structural detail worth noticing. It does not need an outlet, a graveyard payoff, or a death-matters engine to convert. It is its own onboard draw button with a flying body attached, so an aggressive draw gets two damage in the air and a slow draw gets a card back, with no investment lost either way. That self-contained design also sets the cost where it should be: paying two mana plus the creature for a single card is steep enough that the cantrip is a floor rather than a plan. As Phyrexian fauna it reads as expendable on purpose, the kind of minor horror meant to be spent rather than protected, and the card's whole shape rewards treating it that way: send it in until the board stalls, then cash it for the card you actually wanted.