Krenko triggers, putting a +1/+1 counter on itself and creating at least five 1/1 Goblin creature tokens.
Activate
Phyrexian Altar five times by sacrificing five creatures, 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.
Results
Infinite +1/+1 counters on a creature.
Infinite colored mana.
Infinite combat phases.
Infinite creature tokens with haste.
Infinite death triggers.
Infinite ETB.
Infinite lifegain.
Infinite lifegain triggers.
Infinite LTB.
Infinite sacrifice triggers.
Metadata
In 6 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).