Sire has the potential to attack, defend, stabilize the board, and a nice built-in protection in the ward ability it hurts a lot to lose 7 life
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Reanimating Cauldron Familiar with Witch's Oven is super powerful, but it turns the game into a long and grindy meal of trauma and sadness, especially on Arena, where new Oven players just sit on priority forever, roping the game down to misery
Summary Lorcana cards, especially special promotional cards and rare variants, have high value and are hard to find
So, even though she may have a drastic difference in value from the others, I had to include her here
Tetzimoc, Primal Death is one of my favorites, as is Renata, Called to the Hunt and Master Biomancer, both efficient ways to get counters on your creatures