If all 3 Musketeers are on the board together with a single copy of Musketeer Tabard, how many cards are drawn
For example, if there are two +1/+1 counters on Aerith Gainsborough and it gets three -1/-1 counters, you'll put two +1/+1 counters on each legendary creature you control when Aerith Gainsborough's third ability resolves
Depending on your deck, Walking Ballista can easily become part of a deadly infinite combo, by utilizing cards like Heliod, Sun-crowned
Though its not a unique card, given that its the exact same Kristoff, Reindeer Keeper thats card number 13 in Shimmering Skies (at least in terms of its printed stats and abilities), theres a unique foil treatment to this card, which also lacks the black border around its Lore symbols
Sorcery Mill (CTRL to add secondary) Protection Zur, Eternal Schemer Flying Enchantment creatures you control have deathtouch, lifelink, and hexproof