Frenzied Arynx
Creature — Cat Beast
Riot (This creature enters with your choice of a +1/+1 counter or haste.)
Trample
: This creature gets +3/+0 until end of turn.
Filip Burburan
Ravnica Allegiance (RNA)
• #173Rulings
If you choose for the creature to gain haste, it gains haste indefinitely. It won't lose it as the turn ends or as another player gains control of it.
(wotc • 2019-01-25)
Riot is a replacement effect. Players can't respond to your choice of +1/+1 counter or haste, and they can't take actions while the creature is on the battlefield without one or the other.
(wotc • 2019-01-25)
If a creature entering the battlefield has riot but can't have a +1/+1 counter put onto it, it gains haste.
(wotc • 2019-01-25)
Rulings
If you choose for the creature to gain haste, it gains haste indefinitely. It won't lose it as the turn ends or as another player gains control of it.
(wotc • 2019-01-25)
Riot is a replacement effect. Players can't respond to your choice of +1/+1 counter or haste, and they can't take actions while the creature is on the battlefield without one or the other.
(wotc • 2019-01-25)
If a creature entering the battlefield has riot but can't have a +1/+1 counter put onto it, it gains haste.
(wotc • 2019-01-25)