While Valgavoths slimmer Rakdos incarnation is stealing a lot of the spotlight right now, the full-fat version is not a Demon to be trifled with
That part has some specific wording, namely it doesnt say legendary permanents, which means even if you completely whiff on the first part of the card, this could be 6 mana to draw 3+ cards at least once
Your early game plan is simple: Get a healthy amount of mana acceleration out with spells like Harrow, Farseek, and Explosive Vegetation or artifacts like Sol Ring and the Signets
7th Spot: Wildfire Wickerfolk The main beatstick of the unusual Gruul FOMO deck, it became an auto-include due to its very efficient mana cost, plus its Delirium synergy connecting well with the multi-card types easily thrown into the graveyard by the deck it belongs to (usually curving at the earliest turn that it drops)
Strong Back A powerful card for Voltron strategies
Goad your opponents and have them destroy each other