Pawn

When Pawn attacks alone, put a +1/+1 on
Pawn until end of turn
{t}, Put an advance counter on
Pawn. Once Pawn has 6 or more advance counters, sacrifice Pawn and put either a
Rook, Knight, Bishop, or The Queen onto
the battlefield tapped.
If Pawn would be put into the graveyard
from anywhere, exile it instead