Primal Surge

The cleanest expression of a deckbuilding constraint ever stapled to a payoff: spend ten mana, and the reward scales precisely with how thoroughly you have purged your deck of instants and sorceries. The process stops dead the moment it exiles a card that is not a permanent, so the card asks for total commitment in the build long before it asks for mana on the table. A deck running even a handful of removal spells gets a fizzle and a whiff; a deck built entirely from creatures, artifacts, enchantments, planeswalkers, and lands dumps its remaining library onto the battlefield in a single resolution. That all-or-nothing math is the whole design: it does not reward incremental optimization, it punishes any deviation from a permanents-only shell with a probabilistic cliff. Notably, it puts permanents in play rather than into your hand, which sidesteps cast triggers and counterspells, though anything with a body still arrives summoning-sick and waits a turn before it can attack. Green's other ways of cheating things onto the battlefield (Natural Order, Green Sun's Zenith, the Tooth and Nail family) all search the library and select exactly what they want; this one refuses to look. It trusts the top of the deck blind, which is why the list-pruning is the price of admission. The satisfaction is binary: you either built the deck it wanted, or you watched the chain die on the first instant or sorcery it turned up.