As I said earlier, by relying on a parasitic mechanic like energy its very hard to fully take advantage of the massive card pool that Pioneer offers
As for Level 11s, theres now the new version of Trishula with a strong Banish effect that makes it the better choice to go into
Scavenging Ooze has been a Constructed sideboard staple forever, so to compare Keen-Eyed Curator to Scavenging Ooze is like comparing raccoons to oozes hmm, maybe these cards are closer than I thought
When you declare an attack, you enter Attack Declaration, this precedes the Damage Step, and if the monsters on your opponent's side of the field change, for example by the effect of Call of the Haunted or by attacking a Number 39: Utopia with no XYZ materials, a replay occurs, allowing that monster to change its attack target, but if you choose not to attack anymore with that monster, you cannot attack with that monster again in that Battle Phase, nor can you change it to DEF position in Main Phase 2
Even for four mana, double strike and trample are a nasty set of keywords