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You can only activate 1 "Dark Advance" per turn

If this face-up card in its owner's Field Zone has left the field because of an opponent's effect, and is now in the GY or banished: You can target any number of "Ninja" monsters with different names in your GY

There is a clause like this, and honestly I can't think of a strong use

You can only control 1 "Ancient Gear Reborn"

Wandering Gryphon Rider provided protection against Nibiru, the Primal Being , while Fateful Adventure could be activated in a Chain behind a Prank-Kids effect to prevent them from being negated by Ash Blossom and Joyous Spring

Being able to draw cards makes a fusion spell one of the finest fusion spells in the game