Hopefully, this helps to make the concept of formats, in general, a little clearer
Language Card : english Creation Date : 16 April 2017 Pokemon Passport Name : Crystal Onix Serie : Black & White Type : Water Attack 1 : Water reflection Resist all water type attacks for 5 turns
(Its a little strange to me that this card is in the green-black deck, rather than the green-blue deck.) The worst-case scenario here is a recurring [mtg_card]Overrun[/mtg_card], but it shouldnt be tough for a green deck to get a 5/5 or bigger into play[mtg_card]Avenger of Zendikar[/mtg_card], say, or any other large creature that brings its own army along
Flitterstep Eidolon More and more saboteur abilities are printed every set, so to ensure you've got at least one creature that can slip through defenses is a job for Flitterstep Eidolon
Auctions can swing wildly either side of that price, too