Runic Armasaur

Green's card-advantage engines almost always pay you for your own initiative: connecting in combat, resolving creatures, untapping mana. This 2/5 inverts that entirely, drawing off the opposing board instead. It keys on every fetchland crack, every Pteramander or Walking Ballista activation, every land that animates itself, every creature ability that isn't producing mana. The carve-out is precise and load-bearing: mana abilities are explicitly excluded, so tapping a Birds of Paradise hands you nothing, but the moment a permanent already in play does anything else (fetch, pump, ping, animate), the trigger fires. Note the boundary carefully. It reads abilities of creatures and lands on the battlefield, so it catches a man-land's activated animation ability but not the attack that follows, since attacking is a turn-based action and not an activated ability. Costs an opponent pays from hand, channel and cycling among them, slip past it too. What you get is a soft tax scaling with how interactive an opponent's deck wants to be: the more their game plan leans on activated abilities, the more it bleeds them, and the less it does against a deck that just curves out creatures. The 5 toughness is the other half of the design, keeping the body alive through the aggressive draws that would otherwise deny the slow drip time to matter. A wall with a grudge, sized to block and built to extract value from a specific category of decks rather than to threaten anyone directly.