A Different Kind of Experiment

Taking the activated abilities of creatures is good, but why stop there? Sure, putting a +1/+1 counter on Avatar of Woe and a Horseshoe Crab means you can pay one blue mana to blow up any creature as often as you want, but that's more-or-less under the purview of what's expected. A better combo essentially chews up and spits out the rules of the game.

1. Have Mycosynth Lattice, March of the Machines and Experiment Kraj out.
2. Play any planeswalker. Thanks to your other cards, it is a planeswalker, an artifact and a creature all at once.
3. Put a +1/+1 counter on the planeswalker. Experiment Kraj now has all activated abilities of the planeswalker. So get this - the rules that say a planeswalker's abilities can only be used once per turn pertain to planeswalkers specifically, which Kraj is not. Since they don't require tapping or anything else, you can use any +X abilities the planeswalker has as much as you want to get an arbitrary number of loyalty counters on Kraj.
4. It's like Christmas morning. Bounce everything with Jace, the Mind Sculptor, immediately wipe your opponent's lands with Ajani Vengeant, throw out Nicol Bolas, Planeswalker's ultimate ability three times just to be safe. Anyone left? The various Chandras can throw all the damage in the world at their faces.

Congratulations, you've just passed Breaking The Game 101. Who knew a planeswalker spark was so easy to replicate?