signed cards mtg I have some cards.... How do I find out value?? What to know about signed

[66] During the COVID-19 pandemic, which drew more players to the online Magic games and generated volumes of data of popular deck constructions, Wizards of the Coast was able to track popular combinations more quickly than in a purely paper game, and in mid-2020, the company banned additional cards that in specific combinations could draw out games far longer than desired

According to EDHREC, only 1,058 decks out of the possible 2 : Attach target Aura attached to a creature to another creature

Kalastria Healer Kalastria Healer is more limited than Hagra Diabolist, but its only 2 mana, so its expected

If you want to include Atraxa, Grand Unifier, just make sure your deck has a wide variety of card types, and that your color identity can support it, of course