Fleeting Strength

Cumulative upkeep {1} (At the beginning of your
upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Creatures you control get +1/+1.
Creatures you control get an additional +1/+1
for each age counter on Fleeting Strength.
If there are 4 or more age counters on Fleeting Strength, creatures you control gain trample.
Sometimes you just need to hold on for a little while
longer.