Mightstone [Antiquities] Basic Psychic Energy You may put them on

You may put them on the top and/or bottom in any order

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

Set: Zendikar Type: Legendary Creature — Angel Rarity: Mythic Cost: {6}{W}{W}{W} Flying

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {2} Each spell costs {3} more to cast except during its controller's turn

Mightstone [Antiquities] Basic Psychic Energy You may put them onSet: Antiquities Type: Artifact Rarity: Uncommon Cost: {4} Attacking creatures get +1 +0. While exploring the sacred cave of Koilos with his brother Mishra and their master Tocasia, Urza fell behind in the Hall of Tagsin, where he discovered the remarkable Mightstone.