Legality depends on the tournament format -- Fervor can be legal in some formats and banned or restricted in others
While we're playing Tergrid because the front side is so powerful in our deck, Tergrid's Lantern sometimes is an even better finisher, and having both Tergrid and its Lantern on the battlefield at once puts our opponent in a really difficult position where, if they discard cards to avoid taking damage to Tergrid's Lantern, we can steal them with Tergrid proper, but if they take the damage, we can quickly burn them out of the game
The results were pretty darned cool, to be frank about this, and I myself even am guilty of doing this
I believe Foil cards are slightly thicker, so those would mess with the calculations, and I have not accounted for double-sleeved cards
Gut, Bestial Fanatic (HBG-13G) - Alchemy Horizons: Baldur's Gate Gut, Bestial Fanatic (HBG-13G) - Alchemy Horizons: Baldur's Gate Wizards of the Coast This item is like new, pulled from a sealed pack