You can use Urza to tap your Winter Orb at the end of your opponent's turn, which makes the Winter Orb null during yours, freeing up your mana during your turns but locking your opponent up on theirs
Casting it wont trigger Yshtolas damage effect since this is a creature card
Creature Artifact - Construct Color tag templates(None) Artifact Creature Payoff (CTRL to add secondary) Creature Qty: 1 Price: $0.35 Millikin , Mill a card: Add
Unfortunately, standard can't hold the value of this card on its own, so it looks like Nissa of Shadowed Boughs will have a hard time maintaining its current price
Its free to play, but in-app purchases and a subscription allow you to unlock a few extra packs per day
More highlights include obscure keywords like Horsemanship, graveyard enchantments, a creature that's both an elephant and a mouse, and the following phrases: "Don't explain anything else", "Each time you gobble", and "when you draw yourself, you win the game"