pokemon greninja cards ex SVP 132 you may discard a Water Energy card from your hand Greninja Cards | Dex -

Now you need a third creature on the battlefield

User peteroupc on Reddit worded it perfectly here: Do Face-down Commanders Still Deal Commander Damage

Its easy enough to get the citys blessing, so this doubles as a win condition, albeit a slow one

Irma, Part-Time Mutant | 2 Colorless Mana, 1 Blue Mana Legendary Creature Human Mutant Shapeshifter At the beginning of combat on your turn, Irma becomes a copy of up to one other target creature you control, except her name is Irma, Part-Time Mutant, and she has this ability

Terastal Festival ex for modern Japanese (still in print, strong chase cards, supply tightening)

**Advanced Floral Invocations** would fit best in a Golgari (black/green) landfallgraveyard hybrid deck that actively self-mills and plays extra lands, such as a Lands, Dredge, or graveyard midrange strategy in Commander or possibly a grindy Pioneer/Modern shell