Cap Raiser: Leo's Signature Ally, Mitch Brown, essentially doubles the effect of a single ally slot he is assigned to, letting Leo put two Allies on it instead of just one, though at the condition they aren't unique
The Second Doctor Marcy: I really don't like politick decks, and this card seems like if you aren't going for politicking, there's probably not a lot of great ways to get value out of this
Invasion of Tarkir can be an extremely efficient removal spell, as well as offering long game value, provided your deck has enough dragons to support it
It can grab Mangara of Corondor if you need to blow something up, for example
During your End Phase: You can target 1 Equip Spell Card in your Graveyard
Activated abilities (written as "Cost: Effect") of Shrines you control are also not affected