Riveteers Decoy

"Must be blocked if able" is a narrower deal than it looks: it does not lure the whole board, it obligates the defender to commit at least one blocker to the 3/1, and the defender chooses which one. That single forced assignment is the entire pitch. Three power kills most early creatures, one toughness means it rarely survives the fight it starts, and neither fact is a drawback because the plan was always to trade. You are not clearing a lane so much as taxing the block: they spend a body absorbing three damage or lose whichever blocker they can least afford, and the decoy dies doing it. Blitz is what turns that one-time trade into a clean transaction rather than a liability. Cast it for the alternative cost and it arrives with haste, demands its block that same turn, and comes stapled to a death-trigger cantrip, so whether the forced block kills it in combat or the end-step sacrifice does, you draw a card either way. That cantrip is the piece that keeps the trade from ever being a raw exchange of cards: the 3/1 was going to die, and Blitz makes sure it dies replacing itself. What you are buying is a single sharp poke at the defender's combat math, a body that forces an unfavorable block or a chunk of life loss, then refunds the card slot on the way out so it never lingers as a dead draw.