Only experience I have with Ante is the Shandalar PC game, but Contract from Below is the most powerful card ever printed. It's miles above any of the other power 9. Darkpact was also important in Shandalar. It's probably weaker in a singleton environment, but when you're anteing multiple cards with things like 4x Contract from Below in your deck and shuffling those contracts back into the deck with Timetwister, Darkpact was important to get back Timetwisters or something else you needed to keep going. Jeweled Bird is also solid. It's floor is a 1 mana cantrip, but it can be better if you have a Timetwister or Regrowth in your deck.
[180 classic cube]