Omniscience Dragon, Sebket-avil D-PS01/047 RR

[G guardian]-Opponent Turn's Guard Step-COST [Discard a card with [Heal] from your hand], and call this card to your (GC) from face down. [AUTO]:When this unit is put on (GC), COST [Counter Blast (1)], discard the top card of your deck, and perform one of the effects below depending on that card's type. ? Normal Unit - This unit gets [Shield]+20000 until end of that battle. ? Trigger Unit - Choose one of your units, and it cannot be hit until end of that battle.