Lancea, Ancestral Dragon of the Ice Mountain (Secret Rare)

1 WATER Tuner + 1+ non-Tuner monsters
Once per Chain, if your opponent Special Summons a monster(s): You can Special Summon 1 Ice Barrier monster from your hand, Deck, Extra Deck, or GY, then you can change 1 opponent's Attack Position monster to Defense Position. You can only use this effect of Lancea, Ancestral Dragon of the Ice Mountain up to twice per turn. If this face-up Synchro Summoned card in its owner's control leaves the field by your opponent: You can Special Summon 1 Ice Barrier Synchro Monster from your Extra Deck. (This is treated as a Synchro Summon.)