Blue isnt lacking card advantage, but your blue decks will gladly accept more
Archmages Charm is extremely pushed, a solid permission spell, a good way to build card advantage for hitting land drops, and a fantastic tool against Deaths Shadow, Wild Nacatl, Goblin Guide, Pyxis of Pandemonium, Champion of the Parish, Aether Vial, Delver of Secrets, Hardened Scales, Amulet of Vigor, Benthic Biomancer, Glistener Elf, Noble Hierarch, Viscera Seer, and sometimes even Hexdrinker (just to mention a few)
The Herald will keep you alive once you would lose the game, while also preventing your opponent from winning the game
The good news is that the sleeves look great and feel amazing, which is atypical of inexpensive sleeves
Mega Absol looks very strong, especially when accompanied with Hydreigon