Doodle Beast - Stego - Battles of Legend: Crystal Revenge (BLCR)

If you control no monsters, or if all monsters you control are Dinosaur monsters: You can Special Summon this card from your hand. If this card is Normal or Special Summoned: You can add 1 "Doodlebook" Spell/Trap from your Deck to your hand, then discard 1 card. You can only use each effect of "Doodle Beast - Stego" once per turn.