Activated Sleeper + Cavalier of Night + Yahenni, Undying Partisan…

€ 1,12
Activated Sleeper
Creature — Phyrexian Shapeshifter
€ 9,66
Cavalier of Night
Creature — Elemental Knight
€ 0,26
Yahenni, Undying Partisan
Legendary Creature — Aetherborn Vampire

Result

Combo data from Commander Spellbook.