Kerato, the Fragile Edge

Whenever a land is put into your graveyard
from play, target creature you control gains
double strike until end of turn. This ability
triggers only once each turn.
{2},{t}, Sacrifice a land: Search your library for
up to two basic land cards and put them onto
the battlefield tapped. Then target creature you
control gets +1/+0 until end of turn for each
land that's entered the battlefield under your
control this turn.