Thankfully, the gap between threats and answers has closed a reasonable amount over the last few years
I can think of a few, like Altar Ibn-La'Ahad, blink decks, cascade decks
and because Limited play is almost always won on the back of creature combat, finding the opportunities to trade one creature, removal spell, or well-placed buff for more than one creature will pay off dividends
The basics will be to use the doubling penetration effect as the axis
All Sunday [Legacy of the Master] NM $0.50 AUD NM $0.50 AUD Shakuyaku [Legacy of the Master] NM $1.50 AUD $0.80 AUD $0.80 AUD NM $0.50 AUD Concasser [Legacy of the Master] $0.80 AUD Douglas Bullet [Legacy of the Master] NM $0.80 AUD Mohji & Cabaji [Legacy of the Master] NM $0.80 AUD Emporio.Ivankov [Legacy of the Master] NM $0.80 AUD Donquixote Rosinante [Legacy of the Master] NM $0.50 AUD Koushirou [Legacy of the Master] $0.80 AUD Zephyr(Navy) [Legacy of the Master] $0.50 AUD I Love You
These two Synchro Monsters are staples for Decks that can run them
