Beyond the basic Arcane Signet and Sol Ring, artifacts that produce mana feel wasted in this deck, so it could have gone heavier on card draw, equipment, or vehicles to really power up this strategy
Oh yes, and even though the Commander precons will have typical prints for each card, you can still get special versions of them via Doctor Who's collector boosters
Note that if you really want to get hold of Ariel, Sonic Warrior for your deck, the standard, Ultra Rare card is selling for just $3 , so you dont have to break the bank unless you really must have the more spectacular version of the card
But if you can protect it and get a few attacks with it, youre probably gonna be doing pretty well
Toxrill is a 7/7 Slug Horror that puts a slime counter on each creature you don't control during each end step, providing each creature with -1/-1 for each slime counter on it