Realm Seekers

The size it enters at is set by the whole table's card economy, not just yours: it counts every card in every player's hand and arrives largest when nobody has committed, smallest after those hands have emptied onto the board. That borrowed body is also the fuel for the second ability, because every counter it shows up with can be spent to fetch a land into hand. So the bigger it enters, the more times it can mine your deck for lands, trading combat presence back into mana and consistency one counter at a time. It converts shared information into resources, then disassembles itself if you let it. The tension is genuine: hold the counters and you have a green beater that scales with a hoarding table, or bleed them off and you have a repeatable land tutor with a clock attached. The printed 0/0 underlines how completely the card depends on context. With every hand empty it still resolves and enters the battlefield, but with no counters to size it up it has zero toughness and is swept away by state-based actions before it does anything: an engine that needs the table to be holding cards just to exist long enough to start spending them. This is a creature in name and a value engine in practice, sized by a number it does not control and built to spend itself into mana.