The Duels series did not feature full sets of Magic cards but selected subsets, and were initially designed to couple a challenging single-player experience with an advanced artificial-intelligence computer opponent
Still, archetypes like Dimir Tempo with Nethergoyf can benefit a lot from the card, and it's a great blocker against any archetype that doesn't play Orcish Bowmasters 4 - Sunspine Lynx Sunspine Lynx offers, for a slightly high cost, efficient hate against The One Ring while also punishing decks with a lot of non-basic lands if their list is more aggressive
Shadow Kin Each player milling three cards gives Shadow Kin 6-12 chances of getting a good creature to copy
Both existed fairly well as they dont explicitly overlap, but Gitrog was just more popular and slowly Mazirek simply became a fixture of its deck
There's just so much good
, Remove six +1/+1 counters from Karlov: Exile target creature