If mana generated with Arena of Glory's last ability is spent to pay any part of a creature spell's cost, including an alternative or additional cost, that creature spell (and the resulting creature) will gain haste until end of turn
The story has been popular in Christian religious art since medieval times (the Louvre has a thirteenth-century example in ivory)
Overlord of the Floodpits | Illustration by Abz J Harding Impending is an alternative cost that lets you cast an enchantment creature for less mana, except that it enters with a number of time counters on it
These cards are bread and butter to most black decks
If you have two M Sceptile-EX and retreat one when it is about to be knocked out, you can fully heal it on the same turn
First, it pushes us into three or four colors, and while cheating creatures into play with Collected Company helps, we often wouldn't have the right colors of mana to level up our creatures