At the beginning of your next end step, Dragonhawk deals 2 damage to each opponent for each of those cards that are still exiled
So evaluate Halana as a commander that gives you access to removal
Emet-Selch, Unsundered // Hades, Sorcerer of Eld Rarity: Mythic Rare TYPE: Legendary Creature // Legendary Creature SUBTYPE: Elder Wizard // Avatar CMC: 3 Mana cost: USD: $7.92 EUR: 7.87 TIX: 0.23 EDHREC RANK: 6600 (2/4) Vigilance Whenever Emet-Selch enters or attacks, draw a card, then discard a card
These lands are mighty for a few reasons, but the most important one is that you can sort out a lot of mana issues because they all have two basic land types - which means you can fetch them up with a lot of different ramp spells, and even fetch lands too
This works like Thief of Sanity, except it trades flexibility for a mana advantage
Thats totally in your imagination