This pair of abilities allows you to make the best use of the haste buffs
This is important, because whenever Orcish Bowmasters enters the battlefield and whenever an opponent draws a card outside of the first they draw in their draw step, Orcish Bowmasters deals 1 damage to any target
Many of them perform a multitude of purposes-card draw plus ramp, removal plus protection, et ceteraand I encourage you to read them through, rather than have me blandly type out their abilities here
Factor in his huge mana cost of ten, putting him out of reach for decks not packing mana ramp, and this card is, at its Core, fairly weak
Then you can -2 him to sac an artifact and recur one, like the classic Goblin Welder or Trash for Treasure
One of the interesting parts of how Sunpearl Kirin works is that with at least one other bounce card, you can set up a constant chain