Id generally say less than 20 , with 20 pushing it, but this can vary depending on your commander
Effortless Master's last ability will count any spells you've cast this turn, which includes Effortless Master itself if you cast it
Tarmogoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1
The final dragon, Crosis, appears when the other four sacrifice themselves in an Urborg Tar-Pit, but he resurrects them and the Primevals begin destroying everything in their path, Phyrexian or otherwise
Cards like Ocelot Pride and Adeline, Resplendent Cathar are great for aggressive starts, but you can also sit on cards like Anim Pakal, Thousandth Moon and Elspeth, Storm Slayer to accumulate value during the midgame while you supply Caesar with plenty of fodder
Nykthos, Shrine to Nyx Nykthos, Shrine to Nyx is a busted land in mono-color decks, mainly green ones that can provide a high devotion count with cards like Old-Growth Troll and Polukranos Reborn