Dash, Teklo Prodigy

Whenever Dash attacks, you may sacrifice an
artifact. If you do, search your library for an
artifact card with mana value equal to 1 plus the
sacrificed artifact's mana value, put that card
onto the battlefield, then shuffle.
Dash {1}{u}{r} (You may cast this spell for its dash
cost. If you do, it gains haste, and it's returned
from the battlefield to its owner's hand at the
beginning of the next end step.)