Top-decking this is bad, but if you can put a creature into play for free, its not tempo loss (Fires of Invention was strong for this reason)
In deck building, this balance is called the "mana curve." Each spell has a mana value, which is the total mana cost of a spell
This is a cycle of two-color MDFCs (modal double-faced cards), meaning you can play them either as the spell on the front side or the land on the back, with each one representing one of Magics color pairs
Besides, Murderous Rider gives us four versatile removal spells straight-up, and I think weve got room for at least four more beyond that
Collector Boosters are the main event, though
Illuminor Szeras feels like a good contender for a deck focused around unearth and other temporary reanimation, using his Secrets of the Soul ability to turn them into mana after theyve fulfilled their duty one last time