Mutant Deity Fortification, Grysfort (G-TCB02/S09EN)

[ G guardian ] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone if three or less) -Opponent Turn's Guard Step-[Choose a card with "Heal" from your hand, and discard it] Call this card to your (GC) from face down. [AUTO]: [Counter Blast (1)] When this unit is placed on (GC) during the battle your vanguard is attacked by your opponent's vanguard, you may pay the cost. If you do, [Rest] all of the units in your opponent's back row, and this unit gets [Shield]+5000 for every two of your opponent's units at [Rest] until end of that battle.