Kodama's Might

As a standalone trick, this is the most ordinary green pump imaginable: +2/+2, one mana, the kind of effect printed dozens of times over. What the Arcane subtype and the splice keyword add is the thing pump spells almost never get to be: free of card cost. Cast any Arcane spell you were already going to cast, reveal this from your hand, pay its splice cost, and the +2/+2 rider tags onto that spell. The revealed card never leaves your hand: splice copies its effects onto the spell on the stack without putting the physical card there, so the same instant is back in hand and available the next time you cast something Arcane. Combat tricks live and die by card economy, and a one-shot trade-up rarely earns the card it spends; bolting the pump onto a removal spell or another Arcane effect erases the card disadvantage entirely while the rider rides along. The reward goes to a deck built densely around Arcane spells rather than one splashing a single trick, and the punishment lands on opponents who do their combat math off the visible board. Splice never returned in a meaningful way after its debut block, which leaves this a clean specimen of a mechanic that tied a spell's value to the deck's spell mix rather than to the spell in isolation.