Selvala, Heart of the Wilds does not have summoning sickness.
Notable Prerequisites
You have a way to give
Selvala vigilance.
You control a creature with power 6 or greater.
Mana Needed
({G} magic symbol) available.
Steps
Declare
Selvala as an attacker.
Holding priority, activate
Selvala by paying ({G} magic symbol) and tapping it, adding at least ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} 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 from step 2.
Results
Infinite creature tokens with haste.
Infinite colored mana.
Infinite combat phases.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.