Match #259543565, Event #12558616
Attempt to cast indomitable creativity where X = 0 for CMC 3 on the stack. After clicking "okay" when mtgo prompts "choose x targets artifacts and/or creatures. (x is currently 0)", there is then a prompt "pay 1RRR" for a total of 4 mana instead of 3 total mana to cast (even though X is zero which would be 3 total mana).
This can lead to less mana to cast things when controlling an opponent's turn (e.g. Emrakul The Promised End, Mindslaver, etc.) which can lead to card advantage that wouldn't exist in paper.
Attempt to cast indomitable creativity where X = 0 for CMC 3 on the stack. After clicking "okay" when mtgo prompts "choose x targets artifacts and/or creatures. (x is currently 0)", there is then a prompt "pay 1RRR" for a total of 4 mana instead of 3 total mana to cast (even though X is zero which would be 3 total mana).
This can lead to less mana to cast things when controlling an opponent's turn (e.g. Emrakul The Promised End, Mindslaver, etc.) which can lead to card advantage that wouldn't exist in paper.