Skizzik

Kicker {R} (You may pay an additional {R} as you cast this spell.)
Trample, haste
At the beginning of the end step, if Skizzik wasn't kicked, sacrifice it.

It skitters across Shiv, each tendril hitting the ground with a sharp snap.

Dominaria

World Championship Decks 2001

Invasion

Kicker o
R (You may pay an additional o
R as you play this spell.)
Trample; haste (This creature may attack and oc
T the turn it comes under your control.)
At end of turn, sacrifice Skizzik unless the kicker cost was paid.

Skizzik’s ability checks at each end step whether it was kicked while it was being cast. You don’t have to pay its kicker cost each turn (and can’t do so, even if you really want to kick it again).