Later designs like Clue tokens and filter artifacts took the same idea and made it much more effective
Lifegain effects fall into two categories: single-effect, big bursts of lifegain from cards like Feed the Clan, and incidental lifegain from cards like Soul Warden and Kambal, Consul of Allocation
Outside each of these starting nations is an initial area where the player can defeat small enemies to start their quest
Like Palkia, its been around for a while (the deck appeared in Brilliant Stars, upon Arceus VSTARs release), but unlike Palkia, Arceus / Duraludon has not changed much in all that time
The Autonomous Furnace All Will Be One added a cycle of mono-colored spheres that can sacrifice to draw a card later in the game
Instant and sorcery spells you cast cost less to cast for each experience counter you have