Can you kill Forge of the Future at base speed, or do you need to kill it through other means?

Ruling: You can kill Forge of the Future at base speed by placing it in your trash. The "Kill this:" text before the colon indicates an activated ability with an activation cost.

Sequence:

• Activate the ability during the neutral open state on your turn (outside of showdown while the chain is empty)
• Place Forge of the Future in your trash as the activation cost
• Resolve the ability effect