While you can only use one of these effects per turn, that will likely never come up as you'll board will already be all set when it's time to use another Thunder Dragondark effect
Marvels turn to play in the TCG sandbox will reportedly fill several sets, beginning in 2025 and stretching into 2026
The foremost of these is Gold Sarcophagus due to the sheer versatility that it provides for the deck
Plus with a fairly high attack stat, it shouldnt be leaving the board any time too soon
On top of that, you may also want to include some creatures that ramp such as Solemn Simulacrum , Burnished Hart, Palladium Myr, etc
Population numbers don't define a collector, your vision and presentatio