Children of the Multiverse

Piggyback (when this creature enters the battlefield
you may place it underneath target creature. As long
as a creature is being piggybacked, it can't attack or
block. Both creatures are affected by spells and abilities
the same.)
Whenever Children of the Multiverse piggybacks
a creature, you gain life equal to the piggybacked
creature's toughness.
{2}{w}: Piggyback another target creature.