The force is lost at the touch of even one of the countless grains of sand.
[CONT]:Sentinel (You may only have up to four cards with "[CONT]:Sentinel" in a deck.) [AUTO](GC):When placed, [COST][discard a card from your hand], and one of your units cannot be hit until end of that battle. [AUTO](VC):When placed, draw a card, and discard a card from your hand.