mtg original playtest cards The Unknown Wizard - Un-Known Event Was given these test cards

You can mutate onto them while theyre face down, then still be able to turn them face up for even more value

Then in Revised, this symbol appeared: It was a tilted T in a circle

Enchantment Color tag templates(None) Hallowed Haunting As long as you control seven or more enchantments, creatures you control have flying and vigilance

Rogue's Passage will help a lot in getting those morphed creatures in when they figure out what you're doing

Shelob, Child of Ungoliant 1

River Kelpie Primarily a payoff for mechanics like persist or undying, River Kelpie provides card advantage whenever permanents enter the battlefield from the graveyard