Probably the most common cost for an activated ability is to pay some amount of mana, so most instances of paying mana are to activate an ability
Soulbond is a very odd mechanic, and one that hasn't been returned to much since it was first printed in the original Innistrad block, but Deadeye Navigator is probably the most iconic of the cards with the mechanic due to the ability to go infinite with some pretty innocent looking cards (plus Dockside Extortionist, but we dont need to worry about that one in Commander anymore!)
Certain modern cards can combat the effectiveness of this, such as Trainer card Iono, which sees both players shuffling their cards onto the bottom of their deck, then drawing cards equal to the number of Prize cards they have left
The booster box at CA$419.59 is second-cheapest of the ten Scarlet & Violet sets with one, above only Paradox Rift, and 45% below the CA$760.30 Destined Rivals commands nine weeks later
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