We're coming to the end of Final Fantasy spoiler season, but Wizards of the Coast is still delivering up its daily dose of fresh MTG card spoilers
In Magic's case, this is usually because they cost too much, so by the time you can cast it, you would already be ahead in the match
While only affecting a single creature type restricts Cavern, typal decks can leverage this to ensure their threats get through countermagic, be they efficient merfolk, monstrous dinosaurs, or sneaky goblins
For three mana you get to swing with a 3/4 creature three turns later, so watch out
(You may cast cards with retrace from your graveyard by discarding a land card in addition to paying their other costs.) If a spell you cast with retrace is countered, it's put back into your graveyard
Better grab 'em quickly, in case Wizards decides to pull the plug on its codes feature altogether.