First strike
When Knight of the White Orchid enters, if an opponent controls more lands than you, you may search your library for a Plains card, put it onto the battlefield, then shuffle.

Whenever Knotvine Paladin attacks, it gets +1/+1 until end of turn for each untapped creature you control.

First strike (This creature deals combat damage before creatures without first strike.)
Other Knight creatures you control get +1/+1 and have indestructible. (Damage and effects that say "destroy" don't destroy them.)

Equipped creature gets +3/+0 and has trample and lifelink.
Equip

Knight creatures you control have double strike.

Flying
Devour 1 (As this enters, you may sacrifice any number of creatures. This creature enters with that many +1/+1 counters on it.)
When Voracious Dragon enters, it deals damage to any target equal to twice the number of Goblins it devoured.

Flying
: Mordant Dragon gets +1/+0 until end of turn.
Whenever Mordant Dragon deals combat damage to a player, you may have it deal that much damage to target creature that player controls.

Flying (This creature can't be blocked except by creatures with flying or reach.)
: Shivan Hellkite deals 1 damage to any target.

Amplify 3 (As this creature enters, put three +1/+1 counters on it for each Dragon card you reveal in your hand.)
Flying
: Kilnmouth Dragon deals damage equal to the number of +1/+1 counters on it to any target.

Flying
When Thunder Dragon enters, it deals 3 damage to each creature without flying.