When this creature enters, discover 5.
, Discard this card: It deals 3 damage to target creature or planeswalker.
Legal in
Standard, Pioneer, Modern, Legacy, Vintage, Penny, Commander, Oathbreaker, Brawl, Historic, Timeless
Rulings (9)
If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, you must pay those to cast it.
2023-11-10
If the discovered card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2023-11-10
If you can't cast the discovered card (perhaps because there are no legal targets for the spell), you'll put it into your hand.
2023-11-10
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
2023-11-10