The former was introduced in the Black & White series' Dark Explorers expansion, and the latter in Sun & Moon 's Ultra Prism
Being able to flip a 15/15 Worldspine Wurm up is a great party trick, but there are other great cards in here like Ashaya, Soul of the Wild, and Aesi, Tyrant of Gyre Strait
If you are instructed to perform an action on your commander (e less to cast
Thunder Dragon Colossus : Keeps your opponent from adding cards from their main deck to their hand (but they can still draw cards)
and Pokmon VSTAR, an evolution of Pokmon V with VSTAR Power abilities that can only be used once per game due to their strength
Further Upgrades Add better modify support like Kodama of the West Tree, better ramp for creatures with Animar, Soul of Elements, the other +1/+1 counter doubler Branching Evolution, but above all add some of the best untappers like Thousand-Year Elixir and Minamo, School at Water's Edge