Biblioplex Kraken
Blue fatties have always paid for their evasion in the printing cost, either baked in as a keyword or bolted on with a rider. This 4/5 manufactures its evasion instead, and only on the turns it wants to. The attack ability bounces a friendly creature back to hand to send the Kraken through unblocked, which reads like a tax until you notice which creatures are worth picking up: the ones with enter-the-battlefield effects. Each swing then rebuys a trigger and guarantees the damage lands in one motion. The choice is made on resolution rather than by targeting, so it slips past hexproof and shroud, and it can even scoop up a creature you have stolen from an opponent, handing it back to its owner while you slide in unblocked. The word "another" is load-bearing: the ability cannot pick up the Kraken itself, so there is no self-recursion loop back into its own scry 3. What sits alongside it is a repeatable outlet for flicker payoffs, cashing an enter effect again while the attack still connects. The 4/5 body is why the bounce stays optional rather than mandatory: it trades up on defense and pushes through on offense even with nothing left to return, so you conjure evasion only when the trigger or the damage is worth more than whatever leaves to enable it, and hold everything steady otherwise. The price scales with how much you value what you sacrifice from the battlefield, a subtler dial than most creatures this size offer.
