pokemon booster pack plasma storm XY & Plasma Freeze EX ready to do battle Plasma Storm Booster Pack -

Its 4 mana for an unconditional board wipe

Four mana is the gold standard for cards like Coastal PiracyCoastal Piracy, which only draw one card per creature, so StarwinderStarwinder clearly has the edge in this sense

Witch's Nest is using the tap symbol to limit you to using the ability once per turn, much as we use it on artifacts

Like @Dyl mentioned several lower grade Unlimited examples have been popping up, many in the PSA 4-7 range going for around $800USD and lower on eBay

Items not paid for after the 3rd day of sale are deemed noncollectable and marked bidder is marked as a non-paying bidder

If you truly want to experience some of the creativity within Commander, you should definitely try out some of these decks