Just like a convoke deck, were playing creatures in order to generate resources to then play more creatures, and relying on that snowball to rapidly go wider than our opponents and then beat them down
So any of your other coin flip cards can trigger its ability, as can opponents coin flips from commonly-used cards like Mana Crypt
Silverquill Lecturer: Has nothing to do with this deck theme, but demonstrate is a cool ability to throw on creatures
Wizards of the Coast rarely tells you what that card is ahead of time, and its value can vary a lot
The downside of these cards though is lots of playgroups really don't like these cards so it's rude to play them at those tables, and also their win% goes down if your opponents both hate these cards and know you run them since they will gang up and kill you (ignoring everything else) so you don't get a chance to cast them
Its worth noting here that scarcity plays a bigger part than demand does in Crucibles price