Phyrexian Colossus

Phyrexian Colossus enters the battlefield with {x} +1/+1 counters on it. You may also pay {x} by sacrificing creatures, contributing {1} per sacrificed creature.
Phyrexian Colossus gains the following benefits depending on how many counters are on it:
• 5 +1/+1 Counters - Gains Trample
• 7 +1/+1 Counters - Gains Vigilance
• 10 +1/+1 Counters - Gains First Strike