Najeela, the Blade-Blossom | Bear Umbra

Cards

Najeela and
Bear Umbra on the battlefield.
Bear Umbra attached to
Najeela.
Najeela does not have summoning sickness.
An opponent is unable to kill
Najeela.
Lands you control can tap to produce at least ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .

Declare
Najeela as an attacker, attacking an opponent unable to block and kill it.
Najeela and
Bear Umbra triggers.
Resolve the
Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
Resolve the
Bear Umbra trigger, untapping all lands you control.
Activate all lands you control by tapping them, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Activate
Najeela by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat each combat phase.