relic card sleeves Stone & Sleeve Kit Made from crystal Isabeau Relic Knights Standard Card

When its summoned you can special summon any level 3 or lower sea serpent straight from the deck

Heres what it does: Once per turn, you can either special summon 2 Rokket monsters from your hand to your side of the field, or you can special summon Rokket monsters from your graveyard until you have the same number of monsters on the field as your opponent

This means you can target a Llanowar Elves with Azorius Arresters triggered ability and prevent your opponent from ramping on the following turn

So yes, virtually everyone will include these cards in their deck

What are the weaknesses and retreat cost of this Prinplup card