Yes, you can block a creature with first strike
The first time you win one of the battles, you can earn rewards such as pack hourglasses, shinedust, shop tickets, and a pack containing one of the events featured promo cards
Skipping turns would be easy with cards like ChronatogChronatog and Magosi, the WaterveilMagosi, the Waterveil, plus you could stretch effects like those on Island SanctuaryIsland Sanctuary and Teferi's ProtectionTeferi's Protection indefinitely, assuming you could skip infinite turns
Frodo, Sauron's Bane both tempts you and gives you a very good payoff for it
Its playable in UR decks with a lot of spells, but even 10-11 noncreatures wasnt enough to get this above 2-3 damage in practice