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Creatures they begin to control later in the turn won't change power and toughness

Sacrificing an artifact doesnt mean too much, especially since you usually use that artifact to cast this spell

Make your biggest creature even bigger

Legality depends on the tournament format -- Reconnaissance Mission can be legal in some formats and banned or restricted in others

While he was always a cool character, it wasnt really until Dominaria came out in 2018 that he cemented himself as a worthwhile card, at least outside of Commander

You're likely to run into an issue where you make a huge mass of Oozes, only to realize that you need to wait until the next turn to attack