When Ulvenwald Ranger enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) {1}{G}: Transform Ulvenwald Ranger. Activate only if it's attacking.
At the beginning of your first main phase, add {R}. Whenever a colossal ability puts one or more counters on a creature you control, Draconic Symphony deals 2 damage to any target.
Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.) When Bristling Baron dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control.
At the beginning of combat on your turn, if you cast both a creature spell and a noncreature spell this turn, untap up to one target land you control. It becomes a 3/1 red Sand creature with haste in addition to its other types until end of turn.
When Inner-Eye Obscurist enters, return each other creature that isn't in Inner-Eye Obscurist's pack to their owners' hand. (Two or more creatures you control with equal power are in a pack.)
I — Exile the top card of your library face down. II — Exile any number of cards from your hand face down. III — Calamity of Yore deals damage to target creature or planeswalker equal to the number of cards you own in exile. Return all cards exiled with Calamity of Yore to their owners' hands.
Assault {1}{G}(Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.) When Caprin Outlander assaults, you gain 3 life.
Deploy 2 (As this enters, you may tap any number of other creatures you control with total power 2 or more.) When Rogue Groundskeeper enters deployed, exile up to two target cards from a single graveyard.
At the beginning of your upkeep, you lose 1 life and choose one — • Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”) • You may sacrifice an artifact. If you do, draw a card.
Whenever a creature you control dies, put a soul counter on Hill of Souls. {T}: Add {C}. {T}, Remove a soul counter from Hill of Souls: Add one mana of any color.
Indestructible As long as your devotion to blue and red is less than seven, Keranos isn't a creature. Whenever you cast an instant or sorcery spell, you may copy that spell. Do this only once each turn. You may choose new targets for the copy.
When Eaveshoppers enters, each opponent discards a card. Inspired — Whenever Eaveshoppers becomes untapped, exile up to one target card from a graveyard. If a land card is exiled this way, put a +1/+1 counter on Eaveshoppers.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) {2}{G}: Crazed Sprareos gets +2/+2 until end of turn. Activate only once each turn.
At the beginning of your upkeep, sacrifice a non-Snake creature or Boon of the Pacts. Then create a 1/1 black Snake creature token with deathtouch. At the beginning of your draw step, draw an additional card. Spells you cast cost {1} less to cast.
Whenever a permanent you control leaves the battlefield, discard a card, then draw a card. {1}{R}, Sacrifice a permanent: Mass Pandemonium deals 1 damage to any target.
Trample Gloamrazer Hydra enters with four +1/+1 counters on it. Whenever a nontoken creature you control dies, if it was embattled, create an X/X green Hydra creature token, where X is that creature's power. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)
Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.) Tap four untapped creatures you control: Unlock Clockwork Astrolarium. If the revealed card is white, put it into your hand. Otherwise, put it on top of your library.