Most theft effects are tied to activated or triggered abilities, so cards like Strionic Resonator and Lithoform Engine ensure a bigger payoff
If you happen to have enough creatures to destroy what you want, thats great, but youd be better off running a similarly priced spell that removes your target like Path to Exile
Try to use Terra and other cards like Gogo: Mysterious Mine, which can become a copy of Terra to quickly get his cost down by adding creatures to the graveyard
Nine willpower, four lore, and the ability to ready every card in the inkwell every time that Mufasa quests make for an exceptional powerful array of stats and abilities
You get evasion, all damage prevented to your attackers, and a massive, indestructible beater to apply pressure
(Then planeswalk away from this phenomenon.) Phenomenon Owned Phenomenons (CTRL to add secondary) Owned Plane Esper Artifact spells cost less to cast