Cards like Fiery Emancipation, Thousand-Year Storm, and Niv-Mizzet, Parun can drop away with a touch of burn, and Izzet stalwarts like Goblin Electromancer, other spellslinger cards like Archmage Emeritus, and then a suite of blue countermagic can amp up the attack
Quantities are limited, and once theyre gone, theyre gone
White has a giant selection of cards that can accomplish boosting up power at instant speed, which allows you to pump Glen after your opponent's declared their flimsy small blockers (or none at all), but before the damage actually goes through
While a lot of cards in Advantures in the Forgotten Realms look pretty tame, we have a lot of new ways to make Treasure available, and exploiting these cheap extra game objects or mana boosts feels likely to be among the most promising paths to try to shake up Standard in the months before rotation.