Keeper of Dragon Magic [CT15-EN004] Ultra Rare Advent Calendar 2018 add up to 2 "Thunder

add up to 2 "Thunder Dragon" from your Deck to your hand

You can only use each effect of "Catoblepas

Once per battle

its ATK/DEF become half its current ATK/DEF until the end of this turn

while this card is in your GY: You can place this card face-up in your Spell & Trap Zone

Keeper of Dragon Magic [CT15-EN004] Ultra Rare Advent Calendar 2018 add up to 2 "ThunderSet: 2018 Mega Tins Card type: Effect Monster Rarity: Ultra Rare Attack: 1800 Defense: 1300 If this card is Normal or Special Summoned: You can discard 1 card; add 1 "Polymerization" Normal Spell or "Fusion" Normal Spell from your Deck to your hand. You can reveal 1 Fusion Monster in your Extra Deck; Special Summon 1 of the Fusion Materials whose name is specifically listed on that card from your GY in face down Defense Position. You can only use each