As an additional cost to cast this spell, exile two permanent cards from your graveyard.
Whenever Spikey, Jack's Gravetiller deals combat damage to a player, return a card exiled with it to its owner's hand.
You may cast Spikey from your graveyard.

Whenever you amp it up, Spirit of the Crowd gets +1/+1 and gains trample until end of turn.

Flying
Drop — When Staggering Wyvern enters, if you didn't cast any creature spells during your last turn, tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Whenever Steelhorn Crusher or another artifact you control enters, artifact creatures you control gain menace until end of turn.

Ward {2}
Amity — Whenever Surging Mudskipper attacks, surveil 1. You may play that card from your graveyard this turn. If exactly one other creature attacked with it, this ability triggers three times instead.

{T}: Add {C}.
Spellcharge 4

Flash
When The Aqua Crew enters, mill six cards, then you gain 1 life for each card type among cards in your graveyard.
Whenever you cast a spell from your graveyard, you may have target nonland permanent become an Island land. This ability triggers only once unless you control a creature named Warden of Depths.

Vigilance
When The Magma Council enters, it deals damage equal to the number of cards types among permanents you control to target opponent.
Landfall — Once each turn, when a land you control enters, you may have target nonland permanent become a Mountain land.

Flying
Ward—{2}, Pay 2 life.
Whenever you cast a noncreature spell, draw a card.

{1}, Remove a +1/+1 counter from Traveler of Dawn: Exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Equipped creature gets +2/+2.
Equip {2}
Spellcharge 4

Drop — When Viral Upstarts enters, if you didn't cast any creature spells during your last turn, draw a card and you lose 1 life.

Flying, trample, haste
Vishanki Hellkite enters with a +1/+1 counter on it for each mana from an artifact source spent to cast it.

Flying, haste
Amity — Whenever you attack with Warden of Heart and exactly one other creature, you may put a legendary or Dragon card from your hand onto the battlefield tapped and attacking.

Flying
Amity — Whenever you attack with Warden of Soul and exactly one other creature, search your library for a legendary or Dragon card, reveal it, put it into your hand, then shuffle.

Flying
When Warden of Wishes enters, put three wish counters on it, then you gain 7 life.
Whenever you lose life, you may remove a wish counter from Warden of Wishes. If you do, put a card you own from outside the game into your hand.

Prowess, prowess

When Widowed Maiden enters, return target creature card from your graveyard to your hand.
Spellcharge 3

Whenever your Champion attacks, Xarr's Mockery gains indestructible until end of turn.

When Zakros General enters, choose one —
• You may return an enchantment you control to its owner's hand.
• Return target enchantment card from your graveyard to your hand.

When Ace Tamer enters, look at the top six cards of your library. You may reveal a non-Human creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

When Adaptive Hydra enters, teach it your choice of haste, menace, or vigilance. Then repeat this process X times.

Aggressor Model enters with a +1/+1 counter on it.

Whenever you cast a spell, if mana from an artifact source was spent to cast it, you may copy that spell, and you may choose new targets for the copy. Do this only once each turn.

Whenever a player attacks with two or more creatures, create a Treasure token.
Whenever a player casts their second spell each turn, create a 1/1 colorless Cyborg artifact creature token.
Cybersoul {7}{W}{B}