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Specialize lets you pay mana and discard a card to essentially transform the specialize card into a different version of the card that has some effects unique to the color your specialized in

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An artifact creature card put onto the battlefield by Ultra Magnus, Tactician's last ability is an attacking creature, but since it wasn't declared as an attacker, it never "attacked," and this will not cause abilities that trigger when a creature attacks to trigger

Ravenous Gigantotherium Ravenous Gigantotherium has the potential to be very big, even acting as a two-for-one or even a sweeper in a tokens deck