Flash
When Narzi, Hero of the Mokar enters, up to one other target creature gets +1/+1 and gains indestructible until end of turn. If she wandered, other creatures you control get +1/+1 and gain indestructible until end of turn instead.
Wander {4}{W}{W}

New Recruit has first strike as long as it is attacking.
When New Recruit dies, create a 2/2 black Zombie creature token.

Whenever another creature you control enters, you gain 2 life.

Enchant creature you control
All damage that would be dealt to you is dealt to enchanted creature instead.
If a source would deal damage to enchanted creature, if you control three or more enchantments, prevent 1 of that damage.

Whenever another creature you control enters, Nomad's Companion gets +1/+1 until end of turn.

Vigilance
Plainscycling {2}

If you would gain life, you gain that much life plus 1 instead.
If one or more tokens would be created under your control, those tokens plus a 0/1 white Goat creature token are created instead.

Whenever this creature becomes tapped, exile up to one target card from an opponent's graveyard.
{3}{W}, {T}: Create a 1/1 white Monk creature token with vigilance.

Flash
When Omen of Victory enters, create a 0/0 white Army creature token, then put two +1/+1 counters on it.
{2}{W}, Sacrifice Omen of Victory: Scry 2.

When Opal-Eye Caretaker enters, put a +1/+1 counter on each creature you control that entered this turn and wasn't cast from your hand.
Wander {1}{W}

Enchant creature
Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Athreos.
When you sacrifice Ordeal of Athreos, return target creature card from your graveyard to the battlefield.

Outlands Prowler has first strike as long as it's your turn.
Landfall — Whenever a land you control enters, Outlands Prowler gets +2/+2 until end of turn.

When Overbearing Researcher enters, put a +1/+1 counter on target creature.
Each creature you control has ward {X}, where X is the number of counters on that creature.

Exile target creature. Tap up to two other target creatures if the exiled creature had power 3 or less.

When Patron of Ephara's Glory enters, create a 0/1 colorless Sculpture artifact creature token.
Whenever a creature you control dies, scry 1, then you gain 1 life.

Flying
Whenever you attack, target attacking creature gets +1/+1 until end of turn. If you control a green permanent, instead put a +1/+1 counter on that creature.

Each player who doesn't control a planeswalker can't cast more than one spell each turn.
Ayeshicycling {3}

Exile target creature you control, then return that card to the battlefield under its owner's control.

Each player who controls an artifact or enchantment creates a 2/2 white Mouse creature token. Then destroy all artifacts and enchantments.

Return up to one target artifact, enchantment, or land card from your graveyard to your hand.
Create two Berry tokens.

Flying
Level up {U/R}
[level 2-4] Flying, prowess
[level 5+] Flying, prowess, prowess, prowess

When this creature enters, exile all other nontoken, non-Error creatures you control. For each card exiled this way, create a 8/9 white Error creature token with “When this token leaves the battlefield, return the exiled card to the battlefield under your control.”

Enchant artifact, creature, or planeswalker
When you control a permanent with mana value greater than enchanted permanent's mana value, exile enchanted permanent.

Plasma Strike deals 3 damage to target attacking, blocking, or tapped creature.

Once each turn, when you activate a creature, you may create a tapped token that's a copy of it, except it's a 1/1 Toy in addition to its other types and it isn't legendary.