Mark of Sakiko attached to a creature with power five or greater that can attack this turn, and that cannot be blocked by an opponent.
({5} magic symbol) available.
Steps
Declare the creature with Mark of Sakiko attached and Najeela, if desired, as attackers.
If Najeela was declared an attacker, it triggers, creating a 1/1 Warrior creature token that is tapped and attacking.
Activate Najeela by paying ({5} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Deal combat damage using the creature that has Mark of Sakiko attached.
The creature triggers, adding at least ({5} magic symbol) .
Repeat each combat phases.
If the creature with Mark of Sakiko attached has power six or greater, this combo will net infinite mana.