As you calculate, keep an eye on your opponent's Life, your own Life, the presence of opposing Blockers, and how many Characters you have, and use whichever the situation calls for.
Garchomp EX The Garchomp card from Space-Time Smackdown was Dragon type but Triumphant Light has made it a Fighting type card, with the EX version to boot
Delighted Halfling was painted first
Trample allows all excess damage a creature deals to be dealt to a player, making it even easier to use abilities that trigger when this happens, while reach allows them to block creatures with flying, which can be nasty if left alone
Giving your opponent life rarely matters and 1 mana to handle almost any creature is cheap enough that you can weave it into most turns
The rest of the set has plenty of strong theming around both Mega Dimension and the sort of darker-themes the sets name evokes