Echoes of Eternity Echoes of Eternity is expensive, but for the triggered abilities of your big colorless cards, six is a bargain to repeat powerful effects found on Scour from Existence, Hideous Taskmaster, and Flayer of Loyalties
Its also just difficult to interact with it completely dodges creature removal, and you cant Counterspell the ninjutsu ability, so the very moment you decide not to block a creature, Kaito, Bane of Nightmares hits the table, and its sticking around at least long enough to use a loyalty ability and pass the turn
Each Collector Booster will have 1 foil or non-foil Godzilla Series Monster guaranteed
Regardless, these three are the most powerful compared to similar cantrips like Opt or Consider, which serve the same purpose but are overall less effective
In this simple world, every deck would want four copies of Ornithopter