This is solid even in formats like EDH where theres always a mana rock to destroy and a Doubling Season or two
(Id like to see a card representing that one time Lorehold fielded a team of four Loxodon rugby players and a shield mage, though.) So the game is mostly a wizard battle, with the caveat that spells that would harm a player, spectator, or the stadium at large are nullified
Every time you target an opposing creature, the triggered ability puts a counter on it, and once the spell resolves, the creature dies, making Shay Cormac an escalating threat
Considering you get 36 basic lands in a booster box, at $2 each, this would put the EV of an Unstable box at $72
They each also get a bonus effect for every roll, with Wyll gaining a +1/+1 counter for every roll and Barbarian Class giving a creature +2/+0 and Menace.