Picture turn two Scourge Wolf, turn three attack for two and cast Thing in the Ice and Magmatic Insight, turn four play a flurry of spells, flip Thing in the Ice, attack for nine, then hopefully figure out a way to turn on double strike on turn five to keep attacking
There are several cycles of Dragons that span all five colors, Dragons on the lower end of the mana curve, and a handful of cards that care about your Dragons too
Thankfully, it seems that Wizards has mostly learned from these mistakes and has been much more cautious about printing mechanics like partner and Eminence that mess with the command zone since 2018
MTG features several non-basic lands that also have basic land types, like Sacred Foundry, which is a mountain and a plains
Thinking about your side of the field, cards like End the Festivities, Forked Bolt, and Play with Fire are burn spells that are very good to deal with convoke decks or small creature/weenie decks, while not being useless against midrange or control