For some reason, I’m unable to attempt to summon Dragon Master Magia with Ultimate Fusion. The card used to work perfectly fine.
Also, I ended up choosing to summon Blue-Eyes Alternative Ultimate Dragon due to lack of better alternative, and ended up deselecting the materials for the summon and trying to press the “X” and it just let me summon it without shuffling any materials.
For Magia, are you trying to Summon it using Blue-Eyes Ultimate Dragon? Since you must use it for Ultimate Fusion, similar to Red-Eyes Fusion requiring Red-Eyes Black Dragon for Dragoon.
No, I’m using 3 Blue-Eyes monsters
Both Red-Eyes Fusion and Ultimate Fusion don’t require the original vanilla monster. Ultimate Fusion only requires that the fusion monster list either Ultimate or White Dragon. Red-Eyes allows you to use any materials listed similarly, like using Red-Eyes Flare for one material for Meteor Black Comet Dragon
Ultimate Fusion does require you use Blue-Eyes White Dragon or Blue-Eyes Ultimate Dragon as material, whichever is listed. Since Magia lists Ultimate, you must use that as material for it.