For a low-power build with 6 cards in each of the ten pairs (60 cards in a 99-card deck), it draws 4.81 cards on average most often 5, with about a 60.7% chance of 5 or more
Orcish Bowmasters is obviously a good card, but crucially, it helps us get that damage to face up a bit, enabling our Commander more often
On-demand events do not award these promo cards to participants
Loxi: This could be pretty neat as a flashback/"cast spells from your graveyard" commander, but I do agree that only once per turn makes this tricky if you don't have ways to copy the trigger, and at that point you're really jumping through some hoops
It's hard to overstate how powerful this can be, especially in higher power levels where some of the most efficient counterspells don't answer creature spells
Think of it like knocking your opponent off-balance in a wrestling match