For the cost of 1 ER, Grant ranges from 2 thwart or 2 attack and 2 damage to yourself to some combo of 6 total thwart and attack. That ceiling is insane for such a low cost, and I think it is enough to compensate for the fail case where you lose him right away. There are some fun ways to build around Grant using Command Team or Get Ready to speed through his available uses or Noble Sacrifice / "You Got This!" to get him out of play. It's a bit risky to build a strategy around a card that may end up removing itself from the game, but there are plenty of allies that work in an ally-readying strategy like Slingshot or the Nicks to provide some redundancy. Unique design and one I am excited to try!