Felix Five-Boots

Replacement effects are unaffected by Felix’s last ability. For example, if Charging Tuskodon (“If Charging Tuskodon would deal combat damage to a player, it deals double that damage to that player instead”) deals combat damage to a player, Felix’s ability won’t cause the damage it deals to be doubled an additional time.

Triggered abilities use the word “when,” “whenever,” or “at.” They’re often written as “[Trigger condition], [effect].” Some keyword abilities are triggered abilities and will have “when,” “whenever,” or “at the beginning of” in their reminder text.

If you somehow control two Felixes, a creature you control dealing combat damage to a player causes abilities of permanents you control to trigger three times. A third Felix causes such abilities to trigger four times, a fourth causes such abilities to trigger five times, and so on.