With most decks running Area Zero Underdepths [Stellar Crown] now, having access to benching up to 8 Pokmon is a huge asset for this deck
Empyrean Eagle There are several good fliers in this set (Dazzling Angel, Healer's Hawk, etc.), so Empyrean Eagle looks like a strong and easy build around
As long as Adeline is on the battlefield (and still a creature), that ability will count Adeline itself
Plus, this works well with discard-friendly cards, such as [c]Hollow One[/c] and [c]Ox of Agonas[/c]
If youre playing a red deck focused on burning down opponents, it can feel like an uphill battle if someone is able to keep gaining life every single turn
While The Explorer is a solid card for accelerating mana development, there are better options like Exploration which allows you to play an additional land without any cost, making it more efficient in achieving the same goal