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Upcoming Universes Beyond booster releases will be legal in all formats

Again, managathering.com has a good rundown of lands and rocks which generate colourless mana, which can be good utility+acceleration

Howling Mine, Dictate of Kruphix and Kami of the Crescent Moon all fill this role, but The Immortal Sun does it without giving your opponents and advantage if you'd rather avoid the group hug

Betor, Ancestors Voice The end step is where Betor, Ancestor's Voice pays you off: It grows a creature based on the life youve gained, then reanimates something with mana value up to the life you lost that turn

Too Greedily, Too Deep

Be Loose With Your Color Identity Sideboarding in Traditional Sealed is a lot different than it is in Constructed formats