For example, Intrepid Trufflesnout's ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat
One of my first commander decks used to be Lands.dec under Child of Alara that used Prismatic Omen to take advantage of such synergies and often won by having the enchantment in play and then casting Scapeshift to fetch Valakut and a bunch of other lands, burning out my opponents
You get a ramp spell early, which helps you get more mana, which helps you cast the more expensive half of the card from your graveyard
If Tanazir Quandrix's power or toughness changes later in the turn, the other creatures you control aren't affected
By discarding an energy card, players can draw two cards, which is great for maintaining hand advantage, but also setting up the discard pile for important plays with cards like Regidrago V and Palkia V
I stopped when I was 13, should try hunting for old sketchbooks when I get a chance