Elysithra the Enthraller

At the beginning of your upkeep, Elysithra can drain 1/1 from each thrall under your control up to twice. You may then target up to one creature an opponent controls with toughness less than 2x the power of Elysithra. Choose one of the following:
• Elysithra gains power and toughness equal to target creature’s until the end of the turn. Target creature becomes a 0/1 thrall under your control.
• Target creature becomes a thrall under your control. Tap Elysithra.
• Target creature become