Esoteric Keywords
This creature can't attack unless defending player controls an island. When you control no islands, sacrifice this creature.
What is islandhome?
The only keyword better than kicker.
What is multikicker?
This ability word joins the likes of landfall and constellation in caring about when you have cards of a certain type enter.
What is alliance?
(You may cast this spell for its THIS cost if you dealt combat damage to a player this turn with an Assassin or commander.)
What is Assassin's Creed
Character select, father & son, and friends forever are all versions of this keyword.
What is partner?
(As this creature enters, put N +1/+1 counters on it for each creature type card you reveal in your hand.)
What is amplify?
Mark Rosewater often cites this ability word as the inspiration for the devotion mechanic.
What is chroma?
While many keywords and ability words in Magic care about the number 4 as a breakpoint, this ability word from a recent faction set cares about the spending five (or more) mana.
What is opus?
(This creature can't be blocked except by creatures with THIS).
What is Portal: Three Kingdoms?
Slapping the word "Commander" in front of this keyword in 2016 was a huge mistake according to Gavin Verhey, probably because it lets you completely ignore Command Tax.
What is ninjutsu?
(When a creature is put into your graveyard from the battlefield, you may pay a cost. If you do, return this card from your graveyard to your hand. Otherwise, exile this card.)
What is recover?
The fear keyword was eventually replaced by this keyword that debuted in Zendikar.
What is intimidate?
This ability word that debuted in Temur colors is was recently included in The Hobbit.
What is ferocious?
(When this creature dies, you may return target Spirit card with mana value N or less from your graveyard to your hand.)
What is Champions of Kamigawa?
While many keywords that originated in Commander Products don't do much in 1v1 formats, all of them do something, except for this one.
What is myriad?
(When this enters, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)
What is champion?
This ability word technically triggers more often than constellation.
What is eerie?
This ability word from original Ravnica cares about creatures sharing colors.
What is radiance?
(If life was paid, this planeswalker enters with two fewer loyalty counters.)
What is Kamigawa: Neon Dynasty?
What is Choose a Background?
This is the only keyword to appear on the Un-card Old Fogey that has never had its reminder text printed on any card.
What is phasing?
Players discovered that two is better than one with this multiplayer keyword and it's successor.
What are hidden agenda and double agenda?
This ability word from a faction set cares about how many creature cards are in your graveyard.
What is undergrowth?
(This permanent enters with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
What is Planar Chaos?
This ability word offers you a bonus, as long as you control your commander.
What is lieutenant?