US$ 25.58
mtg flashback cards Legal in Standard, Rules Text: Flashback, 42 Each instant and sorcery card in your graveyard gains flashback until end of turn Return the Past (WHO) #697
Description
This is an incredible ability that is sure to turn the tide in a game of Commander

As for continuous effects, red has a number of great options now

Wizards of the Coast announced that 300 serialized double rainbow foil Elven Sol Ring cards will be printed, along with 700 Dwarven Sol Rings and 900 Human Sol Rings
Are Split Cards Multicolor