Kalemne, Disciple of Iroas [Commander Anthology Volume II] XY174 sacrifice it unless you sacrifice

sacrifice it unless you sacrifice any number of creatures with total power 12 or greater

– John F Kennedy

While Slingers are the prime example

Set: Junior Super Series Type: Creature — Dragon Rarity: Rare Cost: {4}{R}{R} Flying

Kalemne, Disciple of Iroas [Commander Anthology Volume II] XY174 sacrifice it unless you sacrificeSet: Commander Anthology Volume II Type: Legendary Creature Giant Soldier Rarity: Mythic Cost: {2}{R}{W} Double strike, vigilance Whenever you cast a creature spell with converted mana cost 5 or greater, you get an experience counter. Kalemne, Disciple of Iroas gets +1 +1 for each experience counter you have.