Force of Will Force of Will is easily the card that deserves to come top of this list
Delirium Whenever a source you control deals noncombat damage to an opponent, if there are four or more card types among cards in your graveyard, this creature deals that amount of damage to target creature that player controls
When figuring the percentages of rares and mythics, remember that Wizards uses a 2:1 ratio for rares and mythics
This card grants back-to-back upkeeps, though, so you wont be able to do something in your main phase and try to win afterwards
There are so many fun ways you can use this, but it is also a great resource to have in your classroom for when students have a bit of downtime
And so, with a heavy heart, I have removed By Force