Wall of Fire (Retro) [30th Anniversary Edition] IDW Comics 2014 Set: Theros Beyond Death Promos

Set: Theros Beyond Death Promos Type: Legendary Creature — Elder Giant Rarity: Mythic Cost: {1}{G}{U} When Uro enters the battlefield

that player sacrifices a creature

Set: Betrayers of Kamigawa Type: Legendary Creature — Human Ninja Rarity: Rare Cost: {3}{U}{U} Ninjutsu {2}{U}{U} ({2}{U}{U}

They only specify the consequences should you fail

Wall of Fire (Retro) [30th Anniversary Edition] IDW Comics 2014 Set: Theros Beyond Death PromosSet: 30th Anniversary Edition Type: Creature Wall Rarity: Uncommon Cost: {1}{R}{R} Defender (This creature can't attack.) {R}: Wall of Fire gets +1 +0 until end of turn. Conjured from the bowels of hell, the fiery wall forms an impassable barrier, searing the soul of any creature attempting to pass through its terrible bursts of flame.