Four Doorways

If you already have a active dungeon, return Four doorways to your hand and it is {1} less to cast.
Roll a D20
1-5 - Venture into the Tomb of Annihilation
6-10 - Venture into the Dungeon of the Mad
Mage
11-15 Venture into the Lost Mine of Phandelver
12-20 - Venture into the Inner Planes