Note that, because the Rainbow Rares don't feature different base artwork than the Full Arts, this will touch on the value so that completionist collectors know what they're in for
if a spell alters one of these land types, the other land type is unaffected
When you cast a spell with offering by sacrificing a permanent, generic mana in the sacrificed permanent's mana cost reduces only generic mana in the spell's total cost
Empty is heavily played in casual town and is arguably the most played storm card in print
With the singleton decks required by the Commander format, they'll eventually have to get rid of certain cards central to their strategies, leaving them unable to play how they want
I get that this is a totally stylist choice, but to the folks that say this card sucks, youre simply wrong