Swap Frog [OP03-EN001] Ultimate Rare Uncommon if you control no monsters:

if you control no monsters: You can Special Summon "Timelord" monsters with different names

but Tributes are required for monsters Level 5 or more

) You can also Xyz Summon this card by discarding 1 "Rank-Up-Magic" Normal Spell Card

inflict piercing battle damage to your opponent

Swap Frog [OP03-EN001] Ultimate Rare Uncommon if you control no monsters:Set: OTS Tournament Pack 3 Card type: Effect Monster Rarity: Ultimate Rare Attack: 1000 Defense: 500 You can Special Summon this card (from your hand) by discarding 1 other WATER monster. When this card is Summoned: You can send 1 Level 2 or lower Aqua Type WATER monster from your Deck or face up from your field to the Graveyard. Once per turn: You can return 1 monster you control to the hand; you can Normal Summon 1 "Frog" monster during your Main