@Rezzahan#77802 ok, it happened to me again! and this time I had auto tap disabled!!!! this is definitely a bug that needs to be fixed as soon as possible!

@Rezzahan#77802 the problem is that if you want to use the team work cost, it won't let you even if you have 6 mana and a total of 5 of creatures power including spider manifestation. It will force you to tap the spider and tell you you don't have the resources to use the team work cost which is not true. This is stupid auto tap and it should be fixed. I don't want to disable autotap just because of this stupidity.

Arena taps Spider Manifestations, because casting your spell will UNTAP it, leaving you with more available mana for the turn. If you do not like how Arena autotaps, you can disable the autotapper in the settings menu. Doing so results in Arena merely suggesting how to tap. You can then either accept the proposal, or you can manually use your mana sources and floating mana until Arena's constantly updating suggestion aligns with your wishes, and then accept to let it autotap the remainder of that suggestion.