Gehrman Chosen by The Ones

Vigilance, Lifelink, Reach. At the beginning of each turn, choose a card from an hand. You may play it this turn for its cost or if it’s a land, you pay {5}.
The owner of the chosen card draws a card.

Whenever you play a card this way, Gehrman gets +X/+X until your unkeep, where X is the spended mana, exile it instead of putting it into its owner’s graveyard if needed. You may cast it from exile as long as Gehrman is on the battlefield, triggering its +X/+X effect.