Voidwielder

The bounce-on-a-body template, sized for the slowest end of the curve. A 1/4 wall stapled to a one-shot Unsummon: the tempo gain is real on resolution (a blocker walks back to its owner's hand, the wall holds the ground), but the rate asks five mana for an effect that costs one as an instant. The trade-off the design accepts is deliberate: it pays full price for something that exists at a fraction of the cost elsewhere, and gets a defensive body to justify the markup. The toughness is doing the structural work here, not the bounce. A 1/4 stops most early aggression cold and survives the small burn that would otherwise pick off a flimsier wizard, so the creature earns its keep on defense whether or not the entry trigger finds a worthwhile target. The "may" is the quiet mercy: with nothing worth bouncing, you hold the wall and lose nothing. This is the entry-level shape of a long blue tradition (the value blocker that buys a tempo swing as it arrives), built at common-rarity power so it teaches the pattern without warping anything.