At time of writing, there are only two known commons that reward this unnamed mechanic: Arena Trickster, which turns from an unexciting Hill Giant into a Rampaging Baloth (and can continue to grow), and Naiad of Hidden Coves, which allows you to play two Vexing Gulls on turn four
Murktide Regent A very powerful dragon Murktide Regent is a seven-mana Blue 3/3 with flying that gets a +1/+1 counter on it whenever an instant or sorcery leaves your graveyard
With The Lost Caverns of Ixalan, these were available in set boosters, but not in draft boosters
You can even loop two of these to keep up your spell triggers
Necron Dynasties stands out for being the only monocolour Warhammer 40k MTG deck
It's enjoyable, but it'd be even more so if there were just a few more competitive cards - or fewer cards that have nothing to do with Inventors