Wall of Opposition [Legends] Commander Anthology Volume II The Battle of Tomakul taught

The Battle of Tomakul taught Urza not to rely on fickle reinforcements

and library for any number of cards with the same name as that card and exile them

lands you control gain "Sacrifice this land: Add {B}

Set: Guildpact Type: Creature — Elephant Wizard Rarity: Rare Cost: {3}{W}{W} Whenever an opponent casts a spell

you may pay {1}

Wall of Opposition [Legends] Commander Anthology Volume II The Battle of Tomakul taughtSet: Legends Type: Creature Wall Rarity: Rare Cost: {3}{R}{R} Defender (This creature can't attack.) {1}: Wall of Opposition gets +1 +0 until end of turn. Like so many obstacles in life, the Wall of Opposition is but an illusion, held fast by the focus and belief of the one who creates it.