Enter the Trials

Put any number of trial counters on target creature you control. Then that creature phases out. When the creature would phase in and if it have at least a trial counter on it, remove a trial conter from it insteat and chose one:
• draw a card.
• Put a trial counter on this enchantment.

When the chosen creature phase in put a number of +1/+1 counters on it equal to the number of trial counter on this card times two, than sacrifice this enchantment and gain 5 life.