Elementaria Sanctitude D-PR/731 PR

[CONT]:Sentinel (You may only have up to four cards with "[CONT]:Sentinel" in a deck.)
[CONT]:You may only have one "Elementaria Sanctitude" in a deck.
If your opponent's vanguard has "Triple Drive", this ability can be played without paying the cost.
Play this with COST [discard a card from hand] if your vanguard is grade 3 or less!
Choose one of your units, and it cannot be hit until end of that battle. Remove this card.