Design for Digital

Accept two of Davriel's offers, then accept one
of Davriel's conditions. Seek a card that refers
to a specific spellbook in its rules text. Draft a
card from that spellbook. Conjure a copy of the
drafted card into your hand. The next time you
cast a spell with the same name as the drafted
card, you may spend mana as though it were
mana of any color to cast that spell. Each
nonland card you own that wasn't in your
starting deck perpetually gains "This spell can't
be countered."