what are proxy mtg cards - High Quality MtG Proxy Creating MTG Proxy Cards: A

You can either use it to counter a non-creature spell, or kill the creature you couldn't counter

Wizards of the Coast were kind enough to invite Dexertos Australian team to an Outlaws of Thunder Junction preview event

The front faces of transforming double-faced cards are marked with a triangle facing up on the top left

I think its got a lot of potential in the 99 of various lifegain decks (both Trelasarra, Moon Dancer and Elas il-Kor, Sadistic Pilgrim spring to mind), but I could also see this as the commander of a creature-centric mono-white lifegain deck too

If 3 is chosen, then it can only be damaged, enchanted/equipped, blocked, or targeted by cards that have a mana value of 3