When infector embryo enters the battlefield, Scry 1

Beginning of upkeep, put a hatch counter on it. After it has 3 hatch counters, exile this card and return it to battlefield transformed

All parasites you control have lifelink

When you attack with this creature, you may discard a card. If you do, take control of target creature with power and toughness less than 4 tapped and attacking attacking until end of turn