marshadow pokemon card GX Full Art Holo Pokémon – Evolving Skies Type Marshadow 146 is a great

It taps for colorless mana, good in decks with those cost, and then also for one of each color of mana, so it's a better Birds of Paradise since it taps for colorless too

non creatures i would run: Lifecrafter's Bestiary, Skullclamp, Return of the Wildspeaker, Inspiring Call, Harmonize, Rishkar's Expertise maybe a few things like Fade from History, Beast Within, Nature's Claim, Collector Ouphe is also really strong since you will be running creatures Sure, the mana doubling can be fun, but is it really needed

Or if you have blue, Kindred Discovery and Intruder Alarm make this go arbitrarily large if you have any mana dorks

[casthaven]Deathrite Shaman[/casthaven] is the only four-of creature in the deck

You can also do it to your own creature if you want to activate its Enter the Battlefield effect again

It works even better in a beast tribal deck