When The Love of a Lifetime enters, you may search your library for a legendary creature card that doesn't share a name with a creature you control, reveal it, put it into your hand, then shuffle.
Creatures you control get +1/+1.

When Marie Laurent enters, you may search your library for a card named Hans Nehmann or Diago Maldovo and reveal that card. If you do, shuffle, then put the card on top of it.
Legendary Allies you control have double strike.

When Meat-Market Heifer is put into a graveyard from anywhere, create a Food token.

{3}{W}: Meowsician dares 4.
Whenever a creature you control becomes a Rebel, create a 1/1 white Warrior creature token.

Lifelink
{2}{W}: Ogre of the Gilded Halls gains indestructible until end of turn. Tap it.

Enchant creature you control
At the beginning of each combat, other creatures you control gain first strike until end of turn if enchanted creature has first strike. The same is true for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, trample, vigilance, and ward.

Enchant creature
When Ordained Penitence enters, you may put a lifelink counter on target creature you control.
Enchanted creature can't attack or block, and its activated abilities can't be activated.

When Paladin of the Crownguard enters, you gain 3 life.
Paladin of the Crownguard has first strike as long as it's your turn.

Lifelink
Other creatures you control with lifelink get +1/+1.
If another source you control with lifelink dealing damage would cause you to gain life, you gain twice that much life instead.

Exile target artifact or enchantment.

Once each turn, when a creature with power 2 or less you control enters, you may pay {1}. If you do, draw a card.
{1}{W}: Level 2
At the beginning of combat on your turn, put a +1/+1 counter on up to one target creature you control.
{3}{W}: Level 3
When this Class becomes level 3, exile target nonland permanent an opponent controls until this Class leaves the battlefield.

This spell costs {X} less to cast, where X is the amount of life you have more than your starting life total
Lifelink
When Rose Garden Guardian enters, put a +1/+1 counter on each other creature you control with lifelink.

Target creature you control gets +1/+1 until end of turn. Put a double strike counter on that creature.

{X}: Symbol of the Revolution dares X. X can't be 0.
As long as Symbol of the Revolution is a Rebel, it has flying, lifelink, and vigilance.

True Dexterity deals 4 damage to target attacking, blocking or tapped creature.

First strike, vigilance
Whenever Unburnt Maiden enters or attacks, you may have it dare X, where X is the number of creatures you control. If you don't, create a 1/1 white Warrior creature token.

Creatures you control get +1/+1 until end of turn. Legendary creatures you control gain indestructible until end of turn.

Indulgence
Whenever you indulge, you may untap target permanent you control.

Whenever one or more creatures attack you, create a Food token.

{1}, Sacrifice Wealthy Clergyman: Another target creature you control gains hexproof and indestructible until end of turn. If that creature is a Noble, put a +1/+1 counter on it.

Return up to one target tapped artifact or creature to its owner's hand. Surveil 1.

Absorbed Painter enters with a +1/+1 counter, a flying counter, and a vigilance counter on it.
Absorbed Painter can't attack or block as long as it has a counter on it.
{U}, {T}: You may move a counter from a creature you control to another creature you control. Activate only as a sorcery.

Alehana's Eyes has +1/+1 and can't be blocked as long as you've cast an instant or sorcery spell with mana value 4 or greater this turn.

Ward {2}
At the beginning of your end step, if it's not an extra turn and you've cast three or more instant or sorcery spells with different mana values this turn, take an extra turn after this one.

Enchant creature
Enchanted creature loses all abilities and is a white Peasant with base power and toughness 1/1 named Penitent Prisoner.
When enchanted creature leaves the battlefield, you may draw a card.