Having to pay life and mana for the extra card is a little rough but you don't have to add anything after the mill, making it a recurrable mill engine for reanimator decks, descent decks, self mill etc
The power here lies in the flexibility: This can be used as a surgical removal tool against key creatures in play, a sacrifice outlet for creatures with powerful die triggers, or a means of finishing off opponents by cashing in expensive cards
This card gives a Creature evasion, a stat boost, and protection with the downside of having to sacrifice a Creature on your upkeep
Action cards like "Magical Maneuvers" and Item cards like "Amethyst Coil" help to return characters to your hand and remove damage
If you do, when it enters, they draw a card.) Reach When Scrapshooter enters, if the gift was promised, destroy target artifact or enchantment an opponent controls
Elves are the best at going wide with tokens, ramping substantially, and pumping each other up as other elves enter (looking at you, Marwyn, the Nurturer)