Apex Purple Worm

Trample
You may sacrifice a Creature as part of this cards
Cost, if you do, you reduce the Manacost by the
Power of the Sacrificed Creature.
If you Sacrificed a Creature as part of the
Manacost Apex Purple Worm enters the
Battlefield with a number of +1/+1 Counters
on it equal to the sacrificed creatures toughness.