Rune-Cervin Rider

A 2/2 flier for four mana is a rate nobody builds a deck around, which makes the activated pump the only reason this evasive body earns a slot. The firebreathing accepts green mana, white mana, or any combination, so the sink never insists on a color the deck might be short on: a green-white deck can pour its leftover mana into the air without caring which half of the manabase is flooding. That color-flexibility is the design idea the era's hybrid experiment was chasing, a mana sink built to consume whichever pip happens to be open rather than demanding a specific one. The flying is what turns each invested mana into evasive damage instead of ground stats that just trade off; the more lands left untapped, the larger the swing overhead. This is a creature built for the back half of a game, when an Elf Knight that has run out of better things to buy can convert excess mana into a clock. Nothing about the printed stats asks an opponent to respect it; the open-ended pump is the only thing that keeps it relevant past the turn it resolves.