Sea Stealth Attack

When this card is played you may Place onto the battlefield a "Umi" from your hand or GY

While "Umi" is on your battlefield this card gains these effects
• {u}{t}: you can exile 1 blue creature on your field until your end step; this turn your enchantments and artifacts gain indestructible (even if this card would leave the field)
• When Attackers are declared during any combat phase, Destroy {x} creatures, where {x} is every blue creature whose original converted mana cost is