Entropic Eidolon

The drain itself is trivial: one black mana and a sacrifice for a single point each way, the same slow bleed a lone Blood Artist trigger offers. What separates this Spirit from a one-shot Drain Life on legs is the return clause, and the specific string attached to it. Recursion here is not free in the abstract; it is gated behind casting multicolored spells. Cast something gold, return the Eidolon to your hand, then pay to recast it and to sacrifice it again: the loop runs through the hand and back onto the stack, not straight off the battlefield, and it refuels only as fast as your deck keeps throwing multicolored spells into the mix. That condition dictates everything about where the card belongs. It rewards a deck genuinely soaked in multicolored cards and sits flat in anything that is not. In a color-light shell the trigger never fires and the body reduces to a 2/2 with one point of life-swing locked behind a single activation, the ability stranded for want of a refill. Anchor it in a gold-heavy engine instead and it becomes a piece of slow inevitability, draining a point per cycle and grinding the long game in your favor. It asks for a hard commitment to a guild or wedge in exchange for an attrition engine that, unusually for an early-era design, recurs itself rather than leaning on another card to do the recurring.