Xeno'Jiva, Conflux of Spirits

Flying, Defender
{4}: Switch Xeno'Jiva's power and toughness.
Then it loses defender and gains lifelink until
end of turn.
Whenever Xeno'Jiva deals combat damage to
a creature, tap all other creatures with power
equal to or less than that creature.
"Where did it come from?" -- Hanz