mtg two faced cards copy double card Double-faced card Magic the Gathering Adventures: Eldritch

They're very often aggressively priced (a 0/3 for 1 mana can Block a lot of early Attackers and survive) They often have powerful abilities (consider something like Wall of Reverence, which is a 1/6 Flying Defender Creature for which gains you life equal to the Power of target Creature you control

Adriana provides a respectable buff but, again, Neyali provides a buff and card draw while costing less mana

Its value has reached astronomical heights, exemplified by a reported $800,000 private sale to celebrity collector Post Malone

Mausoleum Guard makes us wait for our value, though when it comes, it comes with flying (which is worth an extra mana or two)