Myriad Construct

The kicker ability doesn't let you pay a kicker cost more than once.

If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.

If a spell targets Myriad Construct more than once, its last ability triggers only once.

If you don't sacrifice Myriad Construct as its last ability resolves (perhaps because its ability triggered more than once and you've already sacrificed it), you still create Construct tokens. The number of tokens you create is determined by Myriad Construct's power as it last existed on the battlefield.

An ability that triggers when a permanent becomes the target of a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.