When this creature enters, choose one —
• Put two +1/+1 counters on this creature.
• Destroy target artifact or enchantment.
• You gain 4 life.
Illustrated by Ryan Pancoast · Guilds of Ravnica · #183
There are no rulings for Knight of Autumn.
When this creature enters, you may destroy target artifact or enchantment.
Flash
• You gain 3 life and surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
• Destroy target enchantment.
• Counter target creature spell.
When this creature enters, if you control two or more Mountains, you may destroy target artifact.
When this creature enters, if you control two or more Plains, you may destroy target enchantment.
• Put a +1/+1 counter on this creature.
Changeling (This card is every creature type.)
When this creature enters, destroy up to one target artifact or enchantment.
Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)