The final bit of text reads: If a legendary permanent or an artifact entering or leaving the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. Basically, Gandalf the White can do a lot of good stuff, and being a 4/5 isnt bad either
If you've completed a dungeon, that creature also gets +5/+0 and gains first strike and menace until end of turn
Try to pick a Commander thats aggressive in combat, provides a mana sink, or draws you cards so you can still be proactive as required
C Common Crystron Prasiortle X WATER Level 2 [ MachineEffect ] ATK 500 DEF 2000 You can target 1 face-up card you control
The Gotta catch em all mentality is always going to define the Pokmon fandom
As a complete beginner to the game, I loved that there was an in-depth tutorial section that taught you all the rules before you were thrown into live servers