Whenever equipped creature deals combat damage to a player, create a 4/4 gold Dragon creature token with flying and roll a d20 (a twenty-sided die)
Mutavault aside, Thoughtseize is the best card in Standard, and Heros Downfall in a world full of giant monsters and threatening planeswalkers is precisely where you want to be
When we target one of our other creatures with a pump spell or a protection spell we get a free poison counter, if our opponent tries to kill our creatures with targeted removal we get a free poison counter, and there are even some strange combo possibilities in Infect itself, especially with Spellskite
If I burn you out with Goblin Charbelcher before you get a turn to use it, well, bummer for you
It also makes for a clone target to really scale things in our favor
Until then, may you have 30 years of doing something you love.