warhammer 40000 mtg commander deck 40,000 (40K) Decks Collector Edition Magic: The Gathering Universes Beyond:

Back in the day, the best way to get rid of your opponents copy of Jace, the Mind Sculptor was to play Jace Beleren

Galadriel lets you ramp lands when you scry, which is actually pretty good

Theres a few Azorius snow cards that tap your opponents creatures or prevent them from untapping, including Icebreaker Kraken, and you can supplement them with other tappers from WOE and other cards with icy or snow card art

Lightning Helix (2005), Bogardan Hellkite (2006), and Ponder (2007)

Others focus on playing a more controlling role with various pieces of interaction, focusing on stopping the opponents win attempts while protecting yours