AI doesn't take disguise costs into account.
When a creature is disguised, and it requires certain mana, and even if you have zero cards in hand, it doesn't take required costs of disguise into account. So say you need two white mana, and you have 3 black and 2 white mana, it will usually use 2 black and one white, so you can't use disguise. This has lost me several matches and should be treated as a changed cost, where you usually decide on the mana afterwards.
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WoeDarkWolf#99480
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