Ice Knight (BROL-EN014) - Brothers of Legend 1st Edition

Gains 400 ATK for each Aqua monster you control. Once per turn: You can activate this effect; you can Normal Summon 1 WATER monster during your Main Phase this turn, in addition to your Normal Summon/Set (you can only gain this effect once per turn), also you cannot Normal or Special Summon monsters for the rest of this turn, except WATER monsters.