Tamiyo, the Moon Sage. Once you activate her -8 ability, discarding nets your cards back into your hand.

Yeah, I seriously considered Tamiyo, but actually ended up cutting her because I was never able to protect her in multiplayer and couldn't get the -8. She got taken out for the Time Warp spells, and I feel like I'm seeing a lot more success with those.Maybe it's because I'm used to being able to -8 her the turn I play her in my planeswalkers deck. She's definitely a card I'm still open to, though.

Teferi, Temporal Archmage might be worthy in this deck as well, since it combos really well with Tezzeret the Seeker for additional mana. Even without Tezzeret, it might be a good card since it has 3 good loyality abilities.

Hm, I hadn't really considered planeswalker Teferi, though now that I think about it I suppose he does draw me four cards in one turn or else get a lot of mana back. I'll look into it, though I need to find a few things I might want to cut.