Unlimited power, toughness, cards, and mana

Experiment Kraj has all activated abilities of each other creature with a +1/+1 counter on it. : Put a +1/+1 counter on target creature.

Put a +1/+1 counter on each of X target creatures.

Transguild Courier is all colors.

: Add . Put a -1/-1 counter on this creature: Untap this creature.

If you tap a permanent for mana, it produces twice as much of that mana instead.

Vivid — : For each color among permanents you control, add one mana of that color.