At the beginning of your upkeep, create a 3/1 red Knight creature token
Some note that while it can deliver explosive plays, it may struggle if the big creatures are answered quickly
Spend Your Wildcards Wisely The most critical resource on Arena is your wildcard collection
The second is more short term, based on the fact that UW Flash and GB Delirium currently make up about 50% of the Standard meta, which is a historically high metagame share, and cards like Archangel Avacyn, Spell Queller, and Emrakul, the Promised End have the ability to invalidate entire archetypes all by themselves, especially in our current answer-lite Standard
One is capable of doing massive damage to the opponent's ex Pokemon, while the other can hit the enemy bench, after a small delay