However if you look at Frank Karsten's analysis for how many colored sources you need, 18 white sources is sufficient to reliably cast Resplendent Angel on turn 3 and Lyra on turn 5, so I'm still not a fan of Drover.
Problem with Resplendent Angel is that you need to gain five life. Ways to do that would be:
- activating the angel (costs 6 mana)
- having Resplendent Angel with a +1/+1 counter on it as well as Lyra on the battlefield (unrealistic, at this point it's basically win more)
- attacking once with Lyra (same as above, you're basically winning already, although this does push the game from winning to won)
- chaining two Revitalize (seems too cute to me too)
Since all of that don't seem too realistic, I'd seriously look at alternatives. Like I wrote I really don't see why you're not running History of Benalia in the slot. Even if Resplendent Angel is really good, History just looks too good to not run.
I find Jeskai usually has a plan to beat Carnage Tyrant e.g. Settle or Cleansing Nova, so I wouldn't count on it winning the game (it's also a 2-of in your deck). Might go up to three if you're not running Adanto Vanguard (which single-handedly walks over Jeskai). Knight of Autumn maindeck would be for more than just Experimental Frenzy, it also answers Conclave Tribunal, Legion's Landing, History of Benalia, Ixalan's Binding ... worst case scenario it's still a 4/3 for 3. Vivien would be both a card advantage planeswalker and a way to kill Lyra. Your deck looks vulnerable to Lyra to be honest, you have no good way to get her off the board once she resolves. I'd be looking at Conclave Tribunal / Ixalan's Binding for this exact situation, or maybe even something like Crushing Canopy in the sideboard. Vivien is also enchantment hate.
If you're more of a ramp deck than midrange, why not run
Pelakka Wurm? Also, what's Assure//Assemble for? It looks like a weak combat trick, doesn't do a good Blossoming Defenses impression (costs twice the mana and doesn't answer exile removal), and by turn 6, making three 2/2 knights hardly seems strong in a deck that isn't looking to go wide.
Resplendent + Angel isnt really win more. The thought process is to have high threat density of must remove threats. T2 Resplendent is the ideal line for the deck. If they remove it, they remove it, but thats one less removal for my next play.
I'll say Assure is not Blossoming, but it is flexible protection from sweepers and tricks, including Cleansing Nova. Assemble lets me rebuild 6 points of power and it isnt a dead draw on an empty board, which was a problem with BD.
Pelakka Wurm, if you werent just being flippant, is just kinda worse and more expensive than the threats I have. I dont think you could find a spot for it, even massive reworking the deck.
I do wonder if the sideboard shouldnt just have the 4th Lyra and 4th Carnage Tyrant for the respective matchups. Worth considering.
Playing vs. other decks running Lyra, I guess my answers would be my exile effects and just resolving mine first.