The Long Journey

put 5 counters on target land, every time the land
is tapped for mana remove a counter and then:
4+ counters left: target creature gets a -1/-1
counter.
3 counters left : target creature gets a -2/-2
counter.
2 counters left: Draw 2 cards
1 counters left: Destroy target artifact.
0 counters left: Create an emblem that gives
all your creatures trample and +2/+2.