Create a 5/5 green Wurm creature token with trample.

When Aether Theorist enters the battlefield, you get (three energy counters).
, Pay : Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Enchant creature
Enchanted creature gets +1/+0 and can't be blocked.

When Ainok Guide enters the battlefield, choose one —
• Put a +1/+1 counter on Ainok Guide.
• Search your library for a basic land card, reveal it, then shuffle your library and put that card on top of it.

Flying
At the beginning of your end step, you may exile an enchantment card from your graveyard. If you do, create a 2/2 black Zombie creature token.

Flying
At the beginning of your end step, you may exile an enchantment card from your graveyard. If you do, create a 2/2 black Zombie creature token.

Return target creature to its owner's hand.
Addendum — If you cast this spell during your main phase, draw a card.

Formidable — : Creatures you control gain menace until end of turn. Activate this ability only if creatures you control have total power 8 or greater. (They can't be blocked except by two or more creatures.)

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield.

As you cascade, you may put a land card from among the exiled cards onto the battlefield tapped. (Do this after the last card is exiled but before deciding whether to cast a nonland card.)

As long as you had another creature enter the battlefield under your control this turn, Bellowing Elk has trample and indestructible.

Target creature you control deals damage equal to its power to any target.
Fuse (You may cast one or both halves of this card from your hand.)

When Borderland Explorer enters the battlefield, each player may discard a card. Each player who discarded a card this way may search their library for a basic land card, reveal it, put it into their hand, then shuffle their library.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
: Boros Challenger gets +1/+1 until end of turn.

Whenever another nontoken creature enters the battlefield, you may pay . If you do, that creature's controller creates a token that's a copy of that creature.

Target creature gets -3/-3 until end of turn. If you control a creature with power 4 or greater, you may return up to one target creature card from your graveyard to your hand.

Target player mills five cards.
Cycling (, Discard this card: Draw a card.)

Defender
Sacrifice another creature: Corpse Blockade gains deathtouch until end of turn.

Trample
When Crested Herdcaller enters the battlefield, create a 3/3 green Dinosaur creature token with trample.

Other Horses you control have indestructible.
At the beginning of each end step, if you gained life this turn, create a 5/5 white Horse creature token.