Uugguu, the Omniplasm

At three colored mana, a 2/2 with no immediate value is far below Modern rate unless an unusually strong Ooze combo emerges.

Could be wrong if Existing or newly printed Ooze-based combo pieces could make its two-copy death payoff exploitable.

Legacy's efficient threats and interaction leave little room for a three-mana setup creature that requires another specific creature to die.

Could be wrong if A fast, resilient Ooze combo shell could make the otherwise slow trigger worth the mana and color commitment.

A reasonable Ooze-tribal sacrifice payoff: each nontoken Ooze death becomes two nonlegendary 2/2 copies, but it needs setup and protection.

Could be wrong if Its tribe may lack enough individually desirable nontoken Oozes, leaving a fragile commander or narrow 99-card inclusion.

Without multiple other nontoken Oozes, this is merely a difficult-to-cast 2/2; a trigger is powerful but needs unsupported tribal density.

Could be wrong if The unrevealed set may contain enough playable Oozes and sacrifice outlets to make it a stronger build-around.