Then when it ETBs, you can phase out any number of other dorks from the battlefield, also to answer the same stuff, but this will answer things the indestructible former one gives like mass bounce of Cyclonic Rift or Aetherize, or exiling of Farewell or -X/-X of Mutilate or sacrifices of Living Death
Cards in the flex spot are things I think can be fiddled with
No, kicking or multikicking a spell doesnt alter that spells mana value
Consider A cantrip that lets you set up that next draw
Creatures (20) 1 Ayli, Eternal Pilgrim 4 Thraben Inspector 3 Scrap Trawler 4 Renegade Rallier 4 Walking Ballista 4 Ravenous Intruder Planeswalkers (2) Lands (19) Spells (19) Creatures Walking Ballista continues to be exceptional, and here, we can even play it under the guise of synergy
You don't want to have too many, but holding onto ways to break up an opponent's plan is helpful