This ability triggers only on cards, so it won’t trigger when a token is put into your opponent’s graveyard.
01-10-2005
wotc
The ability doesn’t care why a card goes to your opponent’s graveyard — only that it does. The ability triggers when a card is put into your opponent’s graveyard from the stack (a spell resolves, fails to resolve, or is countered), from the battlefield (a permanent is destroyed or sacrificed), from the player’s hand (a card is discarded), from the player’s library (from a Millstone-like effect), or from any other zone.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.