i didn't notice this until i conceded and examined all cards in exile and graveyard, but kavaeros, mind bitten has a casting cost of 6 black, cast on turn 3, standard format, no cards that add mana, no enchantments on the field, and look at the turn 5 land on his board....when the spell was cast its mana cost said 2 colorless 1 black... I believe this was accomplished using Cheat Engine app. as i have seen similar things in other games displayed on youtube. or some similar app.

no complaints here. just pointing out that there is a clear exploit of some sort happening