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) .
Steps
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.