You can have up to 15 different lesson cards in your sideboard in BO3, but that wont allow you to have any other regular sideboard cards
Walking Ballista is the easiest payoff creature to disrupt, as the loop cannot proceed without first resolving Heliods activated ability or some similar lifelink-granting effect
Give a creature double strike for the turn
First, I cant speak about the price of the new-to-Magic cards, because Im still working with unrealistically high presale prices at the time of writing
Kona, Rescue Beastie Friendly, trusting, and keenly intelligent, Kona is unique amongst beasties in that she doesn't form attachments to individual survivors
Given how much utility Commander decks often have in order to react to massive creatures and game-ending combos, a card with a high mana cost and additional setups like Jumbo Cactuar isn't the deadliest threat out there