To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Earth Crystal's first ability)
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Vehicles with trample will be best for accomplishing this task since you need to deal combat damage to a player
Helix Pinnacle Enchantment Shroud (This enchantment can't be the target of spells or abilities.) : Put X tower counters on this enchantment
After all, Spoils of War are best when there are more of them
You cast the copy while the ability is resolving and still on the stack