Alaria, Vampire Arcanist

When Alaria, Vampire Arcanist enters the
battlefield, if blue mana was spent to cast this
spell, you may return an instant or sorcery with
mana value 3 of less from the graveyard to the
battlefield, if red mana was spent to cast this
spell, you may create a Blood token.
Blood tokens you control have "{t}: Add one mana
of any color. This mana may only be spent to cast
instant and sorceries."