It should be noted that Allosaurus Shepherd is in contention with mana dorks for your turn 1 play, but you cant deny the power of this card, first released in JumpStart
Speaking of powerful creatures, another two newcomers you'll want to open are Sire of Seven Deaths and Twinflame Tyrant
It has the potential to Special Summon a monster if your opponent has 25 or more cards in their graveyard
Whereas morphs like Stratus Dancer and Apprentice Voidmage simply counter spells when turned face-up, Kheru Spellsnatcher counters a spell and steals it for later use, which can completely swing a game in your favor depending on what spell the Naga snatches
Judy Hopps - Optimistic Officer [Foil] #152 Lorcana Rise of the Floodborn Keep track of your collection value over time
In short, if some cards are more obviously powerful, everyone will play them