Killer Whale

The 3/5 body is the tell: this is a defensive creature wearing an evasion ability, and the friction between those two roles is the whole design. The toughness wants to sit back and block, but the repeatable for flying lets the same card pivot to offense whenever you have mana to spare, climbing over a stalled ground. The pay-per-turn structure is the leash on its power: the flying never sticks, so an opponent who untaps with an answer up gets a clean window, and you cannot leave it airborne as a permanent threat. It is a creature built to be patient, holding the fort with a fat backside, then converting unused mana into the last points of damage once the board gels. The whale flavor is doing earnest work too: a slab of toughness that can briefly breach the surface fits the animal better than a clean keyword line would. This is the kind of efficient, color-pie-honest blue creature the late-1990s sets leaned on, where evasion was something you bought by the turn rather than something you were simply given.