Oh, how disappointing. Again. Pretty was just available 6 months ago. There are so many better choices:
Older Mining Dragons:
Amber
Rune
Glass
Sunstone
Gargoyle
Obsidian
Geode
Pharoah
Fire Opal
Sandstorm
Scarab
Radioactive
Marble
Malachite
Ivory
Crystal
Azurite
Garnet
Abyss
Cursel Idol
Opal
Hidden Gem
Lost Bones
In the Arena, the are many better choices than repeating Marionette. Here's a few:
Spring-y theme:
Bluebell
Hibiscus
Intricate Egg
Winddancer
Crafted Champs:
Battlecaster
Black Knight
Guardian
Immortal
Rainbow Sentinel
Steelflare
Templar
Tough-looking (since it IS the Battle Arena):
Gatekeeper
Gladiator
Leviathan