Tormod's Crypt on you would just trigger once
Bear in mind that the standard and foil cards are identical except for their holographic finish, with no changes to their artwork, rarity or gameplay text
The only downside is that you have to control a basic land, but it doesnt need to be a specific one (like an Island for Gleaming Bastion)
And in Commander, this is a useful tool if you have an ally at the table
However, if you dont have a devotion to red of five or greater, Purphoros stops being a creature on your side, and the enchant creature from Control Magic no longer applies
It's still a really good and really flexible card draw spell, and later in a match lets you dig even deeper into your deck than Stock Up does