Right now, I would say three, since that's the casting cost of many counterspells, but the number that matters is the one for this set
As always, Commander precons arent really equipped to compete at a competitive level (Bracket 2 is literally defined as the precon Bracket), so none of the decks are truly competitive
Notice your sideboard is upping the number of counters for this, and reducing the number of cards like Seal Away or Search for Azcanta where a bad Vivien turn can really set you back on battlefield material
Once your end step begins, it's too late to put a counter on Wakka in order to cause this ability to trigger
"10 Hottest Furry Characters (With NSFW Pictures to Prove It!)"
This super rare Aladdin is one of rubys marquee cards providing a strong body that earns you two lore while draining two from your opponent when banishing an opposing character