mtg cards that proliferate | Magic: The Gathering Wiki out permanents and anything attached to them as though they dont exist until their controllers next turn.) proliferate cards mtg Rules Text:

The one extra mana in its cost is insignificant when you consider the extra card advantage

You can use it turn after turn, plus it taps for a colorless mana to boot

I would take it to a play set in this deck

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If more than one creature enters the battlefield at the same time, or if one or more other creatures enter the battlefield at the same time that Griffin Protector enters the battlefield, Griffin Protector's triggered ability triggers for each of them