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[1] While you control a monster that mentions "Dragon City Atlantis", reduce the Level of all monsters in both players' hands and on the field by 1

This is one of the few that give it an environment to thrive in

For reference, heres what recent sets guarantee per box: VSTAR Universe : 1 SAR + 1 SR Energy + 3 AR + 1 K-Radiant Terastal Fest ex : 1 SAR + 1 ACE SPEC + 3 Reverse Holo + 9 RR MEGA Dream ex : 1 MA + 1 SR + 1 Item SR + 3 AR These arent probabilities theyre guarantees

We then gave it the sacrifice ability to allow you to one-time save your creatures but at the cost of the permanent

Just make sure you watch out for board wipes