Fblthp, Knows the Way

Domain — Fblthp's power is equal to the number of basic land types among lands you control.
When Fblthp enters, search your library for up to X basic land cards with different names, reveal them, put them into your hand, then shuffle.

Garruk, Curse Breaker

Beast

Whenever a creature you control with power 4 or greater enters, draw a card.
+2: Untap up to two target lands.
−3: Create a 4/4 green Beast creature token with trample.
−4: Until your next turn, whenever one or more creatures attack one of your opponents, those creatures get +2/+2 and gain trample until end of turn.

Cruel Calculations

Draw X cards, where X is the number of cards that were put into target player's graveyard from their library this turn.

Ghalta the Unstoppable

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Trample
Other creatures you control have trample.

Jiang Yanggu, Never Alone

Mowu

When Jiang Yanggu enters, create Mowu, a legendary 3/3 green Dog creature token.
At the beginning of your end step, untap all tokens you control.

Loot, the Nexus

{T}: Choose a color. Add one mana of that color for each different power among creatures you control.

Marwyn, the Preserver

Lands you control have hexproof. (They can't be the targets of spells or abilities your opponents control.)
{2}: Return target land card from your graveyard to your hand.

Pia, Aether Ascetic

When Pia enters, you may discard a card. If you do, search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

Ruric Thar, Magecrusher

This spell can't be countered.
Reach, vigilance, trample
Ruric Thar has hexproof as long as they haven't dealt combat damage yet. (They can't be the target of spells or abilities your opponents control.)

Titanbones, Towering Heart

Reach
Whenever you gain life, put two +1/+1 counters on Titanbones.
When you discard this card, you gain 3 life.

Way of the Paradox

Jace

When Way of the Paradox enters, empower Jace 5. (Put five loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")
Whenever you activate a loyalty ability, you gain 1 life. You may play an additional land this turn.

Way of the Wildspeaker

When Way of the Wildspeaker enters, empower Jace 7. (Put seven loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")
Planeswalkers you control have "[−4]: Create a 4/4 green Beast creature token with trample."

Yoshimaru, Scrappy Stray

When Yoshimaru enters, another target creature you control fights up to one target creature an opponent controls. (Each deals damage equal to its power to the other.)
{6}: Put a +1/+1 counter on target nonlegendary creature.

Cryotheory Adept

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{3}{U}, Exile this card from your graveyard: Tap target creature and put a stun counter on it. Activate only as a sorcery. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Edgar, Ancient Bloodlord

Whenever another creature or planeswalker you control dies, you gain 1 life.
{2}, Sacrifice another creature or planeswalker: Put a +1/+1 counter on Edgar. He gains menace until end of turn. (He can't be blocked except by two or more creatures.)

Hapatra, the Desert Fang

When Hapatra enters, for each opponent, put X -1/-1 counters on up to one target creature that player controls, where X is the greatest mana value among cards in your graveyard.

Reality Fracture