Mermail Abyssocea [MP14-EN016] Common Union/Effect Monster is activated while you control

is activated while you control at least 1 "Yosenju" card

but its original ATK becomes 0

Set: 2018 Mega-Tins Card type: Synchro/Effect Monster Rarity: Ultra Rare Attack: 2100 Defense: 1200 1 Tuner + 1+ non-Tuner monsters When this card is Synchro Summoned while you control no other monsters: You can target 1 "Junk" monster in your GY

Once per turn: You can change this card to face-down Defense Position

Set: World Superstars Card type: Normal Trap Rarity: Super Rare Apply these effects until the end of this turn

Mermail Abyssocea [MP14-EN016] Common Union/Effect Monster is activated while you controlSet: 2014 Mega Tins Mega Pack Card type: Effect Monster Rarity: Common Attack: 1100 Defense: 1900 You can target 1 "Mermail" monster you control; Special Summon any number of Level 4 or lower "Mermail" monsters from your Deck whose combined Levels are less than or equal to the Level of that monster, then send that monster to the Graveyard. You can only use the effect of "Mermail Abyssocea" once per turn.