Adding large quantities of colorless mana to your mana pool for each creature ( including tokens ) that enters the battlefield can enable some incredibly powerful shenanigans
Creature - Wall Color tag templates(None) Amaranthine Wall Defender : This creature gains indestructible until end of turn
While the phrase Reverse the Polarity didn't originate on Doctor Who, it was certainly popularized by it, originally from the run of Jon Pertwees Third Doctor
If you ping a Bloodthrone Vampire something is going to die and it will still be a 1/1 next turn
This means you could have it come in as a fetch land, or a land that can turn into a creature, or countless other amazing land cards that Magic: The Gathering has released over its many years
Your other creatures will usually act as a defensive wall and resource engine, tapping down immediately before your turn to draw free cards (or later on, to grow their stats)