Descendant of Masumaro

The growth engine here is a tug-of-war fought across two hands. At your upkeep the creature gains a counter for every card you hold, then sheds one for every card your opponent holds, which makes it a card-advantage referee wearing a creature's body: the wider the gap between your grip and theirs, the bigger it gets, and a board of hellbent opponents turns a 1/1 into a genuine clock. The asymmetry is both what makes it interesting and what makes it fragile, because it pulls against green's natural urge to empty its hand onto the table. Hold cards and you grow; spend them and you shrink, so this belongs to a small green tradition that rewards a fat grip, an idiom the color has always handled awkwardly. The subtle part is that the counters are cumulative, not reset each turn. Most counter creatures only ever climb; this one nets out the difference every upkeep, so if your hand stays consistently larger than your opponent's, the positive counters stack and it ratchets upward for real. But a single turn where they reload and you tap out can hand you a negative delta that strips the counters back off, which is why a discard spell aimed at the opponent functions as a pump effect as much as disruption: every card you tear from their hand is a counter that does not get removed next upkeep. Its size is a running ledger of who is winning the attrition fight, settled one upkeep at a time.