As for creatures which have better power/toughness, let me recommend Commander Eesha, Emeria Angel, Guardian Seraph, and Shalai, Voice of Plenty over Aven Trooper
Veronica, Dissident Scribe While Veronica, Dissident Scribe seems distinctly worse than Inti, Seneschal of the Sun as a mono-red discard commander, I think its one of the stronger cards in the set that we'll see lots of in the 99
Commander is not the only casual format, and Crucible is outstanding in multiples
But, without knowing what those might be, we will keep things as simple as possible
You get the first land from your deck into play, and the rest go into your graveyard as fodder for everything from threshold to reanimation
Destroying every nonland permanent your opponents control set you up to win that turn, provided you have a big enough board state