Keyword: Kicker

Kicker (You may pay an additional as you cast this spell.)
When Ghitu Chronicler enters the battlefield, if it was kicked, return target instant or sorcery card from your graveyard to your hand.

Kicker (You may pay an additional as you cast this spell.)
Fight with Fire deals 5 damage to target creature. If this spell was kicked, it deals 10 damage divided as you choose among any number of targets instead. (Those targets can include players and planeswalkers.)

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

Kicker (You may pay an additional as you cast this spell.)
If Baloth Gorger was kicked, it enters the battlefield with three +1/+1 counters on it.

Kicker (You may pay an additional as you cast this spell.)
When Slinn Voda, the Rising Deep enters the battlefield, if it was kicked, return all creatures to their owners’ hands except for Merfolk, Krakens, Leviathans, Octopuses, and Serpents.

Kicker (You may pay an additional as you cast this spell.)
Flying
When Verix Bladewing enters the battlefield, if it was kicked, create Karox Bladewing, a legendary 4/4 red Dragon creature token with flying.

Kicker (You may pay an additional as you cast this spell.)
Untap target creature. It gets +2/+2 until end of turn. If this spell was kicked, that creature gets +4/+4 until end of turn instead.

Kicker (You may pay an additional as you cast this spell.)
Flying
If Academy Drake was kicked, it enters the battlefield with two +1/+1 counters on it.

Kicker (You may pay an additional as you cast this spell.)
Flying
When Verix Bladewing enters the battlefield, if it was kicked, create Karox Bladewing, a legendary 4/4 red Dragon creature token with flying.

Kicker (You may pay an additional as you cast this spell.)
When Territorial Allosaurus enters the battlefield, if it was kicked, it fights another target creature.

Kicker (You may pay an additional as you cast this spell.)
Search your library for a basic land card, put it onto the battlefield, then shuffle your library. If this spell was kicked, instead search your library for two basic land cards, put them onto the battlefield, then shuffle your library.

Kicker (You may pay an additional as you cast this spell.)
Put a +1/+1 counter on each creature you control. If this spell was kicked, put two +1/+1 counters on each creature you control instead.

Kicker (You may pay an additional as you cast this spell.)
Menace
When Josu Vess, Lich Knight enters the battlefield, if it was kicked, create eight 2/2 black Zombie Knight creature tokens with menace.

Kicker (You may pay an additional as you cast this spell.)
If Grunn, the Lonely King was kicked, it enters the battlefield with five +1/+1 counters on it.
Whenever Grunn attacks alone, double its power and toughness until end of turn.

Kicker (You may pay an additional as you cast this spell.)
Menace
When Josu Vess, Lich Knight enters the battlefield, if it was kicked, create eight 2/2 black Zombie Knight creature tokens with menace.

Kicker (You may pay an additional as you cast this spell.)
Haste
When Keldon Overseer enters the battlefield, if it was kicked, gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.)
Target creature gets -2/-2 until end of turn. If this spell was kicked, that creature gets -5/-5 until end of turn instead.

Kicker (You may pay an additional as you cast this spell.)
Create two 1/1 green Saproling creature tokens. If this spell was kicked, create four of those tokens instead.

Kicker (You may pay an additional as you cast this spell.)
When Caligo Skin-Witch enters the battlefield, if it was kicked, each opponent discards two cards.

Kicker (You may pay an additional as you cast this spell.)
Vigilance, trample
If Untamed Kavu was kicked, it enters the battlefield with three +1/+1 counters on it.

Kicker (You may pay an additional as you cast this spell.)
Menace (This creature can’t be blocked except by two or more creatures.)
If Stronghold Confessor was kicked, it enters the battlefield with two +1/+1 counters on it.

Kicker (You may pay an additional as you cast this spell.)
If Grunn, the Lonely King was kicked, it enters the battlefield with five +1/+1 counters on it.
Whenever Grunn attacks alone, double its power and toughness until end of turn.

Kicker (You may pay an additional as you cast this spell.)
Return target nonland permanent to its owner’s hand. If this spell was kicked, draw a card.

Kicker—Tap an untapped Vampire you control. (You may tap a Vampire you control in addition to any other costs as you cast this spell.)
Target opponent loses half their life, rounded up. If this spell was kicked, you gain life equal to the life lost this way.

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.)
Search your library for a basic land card, put that card onto the battlefield, then shuffle your library. If this spell was kicked, instead search your library for up to two basic land cards, put them onto the battlefield, then shuffle your library.