Mossbridge Troll

The pump ability is the joke and the payload at once: tapping ten power worth of other creatures swings this from a 5/5 to a 25/25 until end of turn, in a single combat. That number is not arbitrary. Ten power is roughly the price of a board you could have just attacked with, so the troll asks you to convert width into one enormous, hard-to-answer lump of stats. The static regeneration underneath folds back into the same idea: a 25/25 that already shrugs off combat damage outright also regenerates through most single removal spells. The whole logic is a trade. You give up a wide swing of incremental damage for one body that is brutally difficult to kill. The saving grace is timing: the tap cost works at instant speed, so an opponent who taps out to sweep your small creatures can hand you the activation and a 25/25 that survives the wrath. The honest catch is the setup. You have to assemble that ten power before the troll does anything, and assembling it usually means you already had a winning board. The body also carries no evasion, so a single chump blocker absorbs the entire swing: the blocker dies to the 25 damage, but it spends none of that overflow on the opponent's life total. This is a finisher for a creature glut that already has reach or trample to spare, a way to fold a pile of bodies into one swing through an open lane.