8 Lava Spike Lava Spike is a simple burn spell that only costs one red mana to cast
If you do go down the counters route, then I feel like All Will Be One is a smash hit for the deck, especially if you can trigger counters in an opponents turn, therefore being able to trigger Valgavoth
Ossification is hyper-efficient, Sheltered by Ghosts is great for aggressive decks, and Imprisoned in the Moon and Song of the Dryads turn bomb permanents into lands
Keep in mind that Rock Chestplate only reduces damage done by your opponents Pokmons attacks , not your own, and any effect that places damage counters obviously arent affected because those are considered effects rather than damage
The best bit is it is so easy to get around the once-each-turn limitation if you just blink it with Displacer Kitten and start the whole thing off again
Providing mono-color decks with both card advantage in the late game and a big chunk of mana, Throne of Eldraine is as strong as mana rocks come