mtg standard card database Magic The Gathering Standard MTG decks —

When Karrthus enters, gain control of all Dragons, then untap all Dragons

Add another rainbow in the background

Dionus, Elvish Archdruid is an uncommon legendary creature from Foundations Jumpstart, one that has a rather unique ability for your next Elf Kindred deck

While youre at it, use Koth of the Hammer and Valakut, the Molten Pinnacle so each of those mountains can become direct damage

Once cards are exiled with the delve ability the cost reduction is already applied to the delve spell being cast, so theres nothing to be responded to

Mogis, God of Slaughter If Im being entirely honest, I think Mogis, God of Slaughter could be better