Thematically, this is supposed to represent the creature surviving combat, but the mechanic does not care how the creature was tapped
For a beginner like you, we recommend the Build & Battle Stadium
They have also made updates on how to navigate mana bases (the colors of magic that allow you to play cards) in the game: Weve also made the mana bases smarter: lands generally dont live in the packets but instead are added after MTG Arena can see your whole deck
Cards like scheming symmetry, brainstorm, crystal ball, and a number of scry cards can put your 6-9 mana spells on top of the library, so that Yuriko will bleed your opponents for massive amounts of damage each turn
Legendary Creature Enchantment - God Nylea, Keen-Eyed Indestructible As long as your devotion to green is less than five, Nylea isn't a creature