If a player can activate Ashiok's -10 ability, they'll get to play with not only an opponent's entire graveyard but also all the cards in their hand, stealing away any potential plans they may have had to put a stop to the onslaught of exiled cards
Golden Flame is a strong ability for energy acceleration, but the attack Shining Feathers is prohibitively expensive, requiring four Fire energy
Hardened Scales is a key reprint, as it allows you to add an additional +1/+1 counter each time you put one on a creature
Unlike the other hammers on this list, Sunforger doesnt rely on combat ability, though it does have some of that via a very meaty +4/+0
In addition, if your Squirrel deck is monogreen there's no reason to avoid artifacts
You need to be pitching something with madness or discarding an Arclight Phoenix before you want it at all, but turning the downside on its head unlocks a lot of potential