dragona paradise booster box new%20supporter%20card Paradise Dragona Booster Box -

Untapping Grim Monolith and Thran Dynamo, and occasionally even Mana Vault, it grants extra mana even the turn you put it into play and turns what was supposed to be a one time boost of mana into a bigger continuous boost of mana while having additional side uses untapping other things, with the traditional creature worth untapping being Phyrexian Colossus

At the end of the Battle Phase, if this card attacked or was attacked: Return all other monsters on the field to the hand, and inflict 300 damage to your opponent for each card returned

You can cast spells after that ability resolves but before you have to sacrifice the creature

You can find them in booster packs just like any other rare pull