Temur Sabertooth + Gaea's Cradle + Great Oak Guardian + Kelpie Guide

Temur Sabertooth

Gaea's Cradle

Great Oak Guardian

Kelpie Guide

How it works

1. Activate Gaea's Cradle by tapping it, adding at least eight .
2. Activate Temur Sabertooth by paying 1, returning Great Oak Guardian to your hand.
3. Cast Great Oak Guardian by paying 5.
4. When Great Oak Guardian enters, it triggers itself, untapping all creatures you control and giving them +2/+2 until end of turn.
5. Activate Kelpie Guide by tapping it, untapping Gaea's Cradle.
6. Repeat.
7. If you control nine or more creatures, this combo will net infinite green mana, which you then may activate Temur Sabertooth any number of times and recast any creatures castable with green mana any number of times, effectively "blinking" your green creatures any number of times.
8. You may also activate Kelpie Guide any number of times.

This elegant loop turns a wide board into a self-sustaining engine by exploiting the massive mana-producing potential of Gaea's Cradle. To fuel the cycle, Kelpie Guide untaps your Cradle each iteration while Temur Sabertooth provides the means to repeatedly bounce and reset Great Oak Guardian, whose enter-the-battlefield trigger untaps both your creatures and lands to keep the chain moving. With enough creatures in play to generate a surplus of green mana beyond the bounce and cast costs, you can repeat the process indefinitely to yield infinite mana, infinite enters-the-battlefield triggers, and arbitrarily large creatures.