mtg.wtf

Menace
Whenever Ogre Chitterlord enters or attacks, create two 1/1 black Rat creature tokens with "This creature can't block." Then if you control five or more Rats, each Rat you control gets +2/+0 until end of turn.

Whenever Ogre Marauder attacks, it gains "Ogre Marauder can't be blocked" until end of turn unless defending player sacrifices a creature of their choice.

Whenever a player casts a spell, tap Ogre Recluse.

When Ogre Savant enters, if {U} was spent to cast it, return target creature to its owner's hand.

{2}{B}{R}: Destroy target creature that was dealt damage this turn.

Ogre Taskmaster can't block.

Trample
Whenever Ojer Kaslem deals combat damage to a player, reveal that many cards from the top of your library. You may put a creature card and/or a land card from among them onto the battlefield. Put the rest on the bottom in a random order.
When Ojer Kaslem dies, return it to the battlefield tapped and transformed under its owner's control.

Flying
Whenever you cast an instant spell from your hand, it gains rebound.
When Ojer Pakpatiq dies, return it to the battlefield tapped and transformed under its owner's control with three time counters on it.

Flying
Megamorph {3}{U}

You may exert Oketra's Avenger as it attacks. When you do, prevent all combat damage that would be dealt to it this turn.

Ninjutsu {3}{B}
Whenever Okiba-Gang Shinobi deals combat damage to a player, that player discards two cards.

As long as you have more cards in hand than each opponent, Okina Nightwatch gets +3/+3.

{W}, {T}: Tap target creature without reminder text. (Reminder text is still any italicized text in parentheses that explains rules you already know.)

Trample
Whenever Oliphaunt attacks, another target creature you control gets +2/+0 and gains trample until end of turn.
Mountaincycling {1}

Flying
Olivia's Bloodsworn can't block.
{R}: Target Vampire gains haste until end of turn.

Flying
When Oltec Cloud Guard enters, create a 1/1 colorless Gnome artifact creature token.

Changeling
Omnipresent Impostor has all card names.
As you search your library for one or more cards, you may choose Omnipresent Impostor as one of those cards. (For example, if you search for two land cards, you may find Omnipresent Impostor and a land card.)

Reach
{T}: Onakke Javelineer deals 2 damage to target player or battle.

Rally — Whenever Ondu Champion or another Ally you control enters, creatures you control gain trample until end of turn.

Haste
At the beginning of your upkeep, return a red creature you control to its owner's hand.

{1}{B}: Target creature you control gains deathtouch until end of turn.

Defender, flying
Wither

Flying
Discard a card: Oona's Prowler gets -2/-0 until end of turn. Any player may activate this ability.