If Cursed Mirror somehow enters the battlefield at the same time as a creature, it can't become a copy of that creature
The deck wants to tap opponents creatures anyway, so adding an additional benefit (and there are fewer benefits better than drawing cards) charges up its power
These days the matches aren't focused on creature combat in the same way, but whenever we start swinging this is still true
Basically, for a flashback card to be playable, the front half either has to be close to on-par for its effect, so the flashback aspect of the card is a bonus / afterthought, or the reward for getting the card in the graveyard is good enough that you don't mind building around a card that's not that great in your hand
Bronze Tablet costs six mana to cast and four to activate
Each plane offers its own texture of gameplay, such as how the Zendikar version of the cube includes three copies of Misty Rainforest to make cards like Planar Core Cards The core of Planar Cube contains 200 cards that remain the same as the cube planeswalks and rotates