Oko, Thief of Crowns Oko, Thief of Crowns is no doubt a powerful multicolor planeswalker, but its not a particularly strong mind control effect
When you lose the flip, Breeches deals damage equal to that spell's mana value to any target
The problem is protection by ghosts and 1-mana bounces
The Demonic Tutor is very slow and hurts tempo a lot but it is usually worth it to increase your overall consistency
The prime example of this would be a Twin deck that maindecks Dispel, which is effectively a 1 mana hard counter against many Burn spells, but is also useful against tons of other decks when the Twin pilot is protecting their combo
The Halloween collectible features Mewtwo diving into action, as it prepares to launch its powerful Psyburn attack