Saprazzan Raider

The bounce-on-block clause is a kind of evasion built backwards. Most unblockable creatures simply ignore defenders; this Merfolk invites the block, then vanishes before damage, so the 1/2 never actually trades. The defender stops a single point of damage by committing a blocker, and in exchange the attacker is the one who pays: the creature snaps back to hand, and pushing it through again costs all over. That is the honest math of the design. Whoever attacks with this is wagering that the chip damage from an open board matters more than the tempo they bleed every time the opponent throws up any blocker at all. It connects only when the path is clear; the moment a defender steps in, the attack converts to nothing but a recast bill. The self-bounce is cheap to swallow precisely because there is no value to lose: no enters-the-battlefield trigger to chase, no aura to strand, just a small body returning home. Note also that the trigger keys off "becomes blocked," which can only happen while attacking; on defense the Raider blocks and takes damage like any other 1/2, with no trick to fall back on. It belongs to the family of fragile evasion-by-inconvenience Merfolk Mercadian Masques was fond of, creatures that win attrition only against opponents who keep their blockers home, and quietly lose it against anyone willing to spend a chump to make the recast hurt.