So, its totally overpowered and not actually intended for gameplay
, Remove six +1/+1 counters from Karlov: Exile target creature
Historically good decks that dont exist in large numbers in Standard right now include Mono-Red Aggro, Big Red, Mono-White Aggro, W/R Aggro, Reanimator, Jund Midrange, Bant Hexproof, Bant Control, G/W Aggro, and B/R Aggro
Unfortunately, since the card's included in the Commander banlist, and isn't you're unlikely to experience the joy of trading a treasure for a Blightsteel Colossus - though you're allowed to run a single copy in Vintage, if you've got the cash
Unfortunately, these seem to be outnumbered by slightly more generic looking cards and ones like Maleficent Monstrous Dragon that might as well be a retouched screengrab from a movie
Read More: Bloomburrow Commander Card Spikes 800% Due to Continued Demand