Byleth, the Fell Star

When Byleth, the Fell Star enters the battlefield
it gets X +1/+1 counters, where X is the number
of soldiers you control.
Double Strike, Lifelink
{w}{u}{b}{r}{g}: Regenerate each soldier you control.
If used during your combat phase, untap all
creatures that attacked this turn and after this
phase there is an additional combat phase.