Need help identifying what cards aren’t valid in this standard deck

I imported it and then went 1 by 1 checking each. I can’t figure out which cards are the issue. Thanks in advance!

Deck 4 Unsummon (FDN) 599 2 Into the Roil (FDN) 509 4 Erudite Wizard (FDN) 37 2 Refute (FDN) 48 24 Island (KTK) 252 3 Mischievous Mystic (FDN) 47 4 Opt (FDN) 512 2 Negate (MOM) 68 3 Homunculus Horde (FDN) 41 4 Long River's Pull (BLB) 58 2 Kiora, the Rising Tide (FDN) 45 4 Curate (STX) 40 2 Think Twice (ISD) 83