It fires knights and dragons into play.
ROTD-EN003 Artillery Catapult Turtle
Level 4 WATER Aqua Effect Monster
You can Tribute 1 monster; Special Summon 1 “Gaia The Fierce Knight” monster, or 1 Level 5 Dragon monster, from your hand or Deck. You can only use this effect of “Artillery Catapult Turtle” once per turn.