mtg double faced cards sleeves How to Sleeve and why | Magic the Gathering | | Double sleeve Keep your cards free of the wear and tear of battle Double-faced card - MTG Wiki

They offer a creature the chance to withstand one source of damage before taking an actual hit

Latias EX SIR (#239) Current market price: $65$90 raw | $180$250 PSA 10 Latias has a devoted fanbase, and this SIR delivers exactly what they want a dreamy, ethereal illustration that showcases the Pokemon beautifully

Furthermore, the card not only synergizes with Beast-type monsters, but it can utilize itself for its powerful effect

That aside, there's an extra point in the rules that states sponsors have the right to disqualify entries "not consistent with the spirit or theme of the Contest." Regardless, it's not been officially confirmed that this is the case or if it's the reason certain entrants have been removed from the Contest, so it might be a different issue entirely

Anime cards can be very valuable