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Equip Artifact - Equipment Color tag templates(None) Samurai's Katana Job select (When this Equipment enters, create a 1/1 colorless Hero creature token, then attach this to it.) Equipped creature gets +2/+2, has trample and haste, and is a Samurai in addition to its other types

But I can foresee situations where you might want to cast every combination of these three effects, and being able to plug in as much mana as you choose to access exactly the effects you want is amazing

Their effects are negated and they are banished during the End Phase

Don't forget that Shadow's damage can trigger on every opponent each turn, further punishing players who favor instant speed spells