Multani

Every card you keep in hand pumps your whole board, which means this avatar fights against the most basic instinct in Magic: deploy your hand. Holding seven cards turns a team of dorks into a lethal swing; emptying your grip to develop the battlefield switches the buff off entirely. That push-pull is the whole identity. It punishes hellbent aggression and rewards a fuller hand than a deck would normally want to keep, asking the pilot to treat each card as a resource with two simultaneous values: what it does when cast, and what it does while held. The flavor lines up with the source. Multani is Dominaria's maro-sorcerer, a being whose power scales with the abundance around it, so a stat boost that tracks your reserves reads as a clean translation of the character into a rules mechanic. Vanguard was Wizards' experiment in handing each player a pre-game avatar that modified starting conditions before the first card was drawn; it never became a permanent format, and avatars like this one survive mostly as a footnote in how the game once thought about pre-game modifiers. But the core idea (a static effect that converts unspent hand size into board pressure) is a sharp piece of design that asks a real question about when to spend and when to hold.