Wall of Fire [Beta Edition] Arena League 2003 puts it on the bottom

puts it on the bottom of their library

Set: Beta Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {G} Enchant creature

Set: Aether Revolt Prerelease Promos Type: Sorcery Rarity: Mythic Cost: {X}{R}{R}{R} Destroy X target artifacts and/or creatures

Whenever you tap a Swamp for mana

Wall of Fire [Beta Edition] Arena League 2003 puts it on the bottomSet: Beta 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.