Whenever you cast a creature spell, tap target creature.
Legalities
Legal
Duel
Penny
Predh
Legacy
Pauper
Vintage
Commander
Premodern
Oathbreaker
Paupercommander
Not Legal
Brawl
Future
Modern
Alchemy
Pioneer
Explorer
Historic
Standard
Timeless
Gladiator
Oldschool
Standardbrawl
Penny
Rulings
2008-04-01
A “creature spell” is any spell with the type Creature, even if it has other types such as Artifact or Enchantment. Older cards of type Summon are also Creature spells.