Najeela, the Blade-Blossom | Spellbinder | Turnabout

Cards

Spellbinder attached to a creature that cannot be blocked and killed by an opponent.
Najeela and the creature with
Spellbinder attached can attack this turn.
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 and the creature with
Spellbinder attached as an attacker.
Najeela triggers, creating a 1/1 Warrior creature token that's tapped and attacking.
Holding priority, activate all mana-producing lands you control by tapping them, adding at least ({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.
Deal combat damage with the creature that has
Spellbinder attached, causing you to gain life equal to the amount of damage dealt this way.
Spellbinder triggers, casting a copy of
Turnabout without paying its mana cost.
Resolve
Turnabout, untapping all tapped lands you control.
Repeat each combat phase.