Unlike traditional card draw, you arent accumulating lands at a faster pace as well when learning, so the typical churn where drawing more cards gives you more spells and the resources to cast them is absent
The power restriction is tough, but red has plenty ways to make Loki large enough to copy whoppers like Mana Geyser
Packs with multiple rare cards do come up, but for the drop rate, take this update from Mark Rosewater
Searching for Mechanics and Keywords Another way to search is by searching the cards rules text, commonly known as the Oracle text, as Oracle is the official place where the current version of a cards rules is kept (it just has an awful, awful search engine, so we use Scryfall instead)
A TOXIC REPUTATION The powerful thing that leaps out at you when first reading the rules for proliferate is how flexible and broad the effect is