2 monsters, including a Reptile monster.
If this card is Link Summoned: You can target 1 face-up monster your opponent controls; its ATK becomes 0. During your Main Phase: You can add a number of Reptile monsters with different names from your Deck to your hand, up to the number of monsters with 0 ATK your opponent controls, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Reptile monsters. You can only use each effect of "Reptilianne Echidna" once per turn.