I might not have all the mechanics down, and Im still misreading what some spells do, but Magic: The Gathering Arena has this way of teaching you without discouraging you
These cards, though, were useless to anyone who wasn't playing the paincast deck, so it cut down on the interconnectivity between the guilds and made decks have less variety as there were fewer cards that could go into every deck
Also, you can pay two mana and tap them to double the number of each counter on an Artifact, Creature, or Land
This actually came to an end during the second Phyrexian Invasion when the ship itself fell to Phyrexian corruption, and its now part of the machines armies
Likewise, the mana-doubling effect on A Display of My Dark Power can lead to untap loops, usually with lands that are also artifacts or creatures