Oh man, didn't even think of cryptolith + evolutionary leap + ramp targets. Run a token deck off nissas, gideons, wastes, whatever- then tap them for mana, sac to leap and get your big ramp target guaranteed.
Trying my hand at a first draft of a new dragon control build utilizing Avacyn. It's actually testing pretty well in goldfishing against mono red Eldrazi, Bant coco with fetchlands since I didn't feel like redoing the manabase for testing and figured it'd only be more of a challenge with them in it, and the humans deck. This is literally the first draft I put down, with no numbers tweaking yet, so super rough:
3 Archangel Avacyn
4 Archangel of Tithes
3 Dragonlord Ojutai
3 Eldrazi Displacer
3 Orator of Ojutai
4 Reflector Mage
2 Sidisi's Faithful
3 Stasis Snare
2 Anticipate
3 Dragonlord's Prerogative
2 Negate
2 Ojutai's Command
1 Blighted Cataract
2 Haven of the Spirit Dragon
4 Island
2 Meandering River
2 Mirrorpool
6 Plains
4 Prarie Stream
4 Rishadan Port
1 Sea Gate Wreckage
The Eldrazi Displacer feels a bit too cute, but has had some crazy plays. The main takeaway I've had is what everyone else already knows- Avacyn is really good, especially when built around with x/4s. I specifically think the interactions between Sidisi's Faithful, Ojutai's Command, and Avacyn are pretty solid as a shell. Ojutai'ing back a faithful while countering their creature and bouncing one of the few creatures you have that will die to Avacyn off the exploit that will triggers the flip feels super good.
Archangel of Tithes has been my favorite card period in testing across these theoretical post rotation decks, but I'm not sure this deck wants to tap out that much mana for anything less than an Ojutai.
The 0/4 walls have matched up pretty well against the numbers in the field. In addition to surviving Avacyn, they also wall most CoCo creatures, Chandra's elementals, and require Chandra herself to die on etb if they actually feel like clearing 0/4s for some reason.