Aven Gagglemaster

The lifegain scales with a board state you had to build anyway. The enter trigger asks nothing but a wide flying board, and a flying board is exactly what a dedicated Bird or Angel deck already fields, so the two life per flier turns a support ability into a payoff for a plan you were running regardless. On its own the card is a modest 4/3 flier at five mana with a single flying body to count: itself. That floor (gain two, get a serviceable evasive body) is the honest baseline, and it keeps the card from being a dead draw when the board is empty. The ceiling arrives once the sky is crowded, where a late-game cast can swing life totals by double digits in a single trigger. That gap between floor and ceiling is the whole design: a common-rarity reward that costs nothing to include in the archetype it wants but pays out only when you have committed to it. It is built for the aggressive-to-midrange flying decks that stall against ground-based aggro, where a big lifegain spike buys the turns needed for evasion to close. Outside that shell it is a fine top-end flier and little more, which is the correct place for a card whose upside is contingent on a board you may not have.