At the beginning of your end step, put a +1/+1 counter on each tapped creature you control.
{G}{W}{U}, Remove five counters from among creatures you control, Sacrifice Severin's Masterwork: Create Chaneryx, Perfect Lifeform, a legendary 10/10 green, white, and blue Leviathan creature token with ward {10}.

When Shadow Sky enters and whenever you cast a spell, each creature target player controls gets -1/-1 until end of turn.

Shell Cove enters tapped.
{T}: Add {G} or {U}.
{9}{G/U}: Shell Cove becomes a 7/7 green and blue Leviathan creature with ward {3} until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to green and blue. Activate only once each turn.

At the beginning of your end step, create a 1/1 blue Ninja creature token with “This creature can't be blocked by creatures with greater power.”
Whenever you activate a ninjutsu ability for the first time each turn, untap up to two target lands you control.

Time loop
I — Create a tapped Treasure token.
II — You may discard a card. If you do, exile the top two cards of your library. You may play one of those cards this turn.
III — This Saga deals 2 damage to each opponent.

Draw cards equal to the greatest power among creatures you control. At the beginning of the next end step, discard that many cards.

{4}{B}: You draw a card and you lose 1 life. This ability costs {1} less to activate for each other Shrine you control. Activate only once each turn.

At the beginning of your upkeep, create a 1/1 white Human creature token for each Shrine you control.

Creatures you control get +1/+1 for each Shrine you control.

At the beginning of your upkeep, exile the top card of your library. You may play it this turn. If you control a number of Shrines greater than or equal to that card's mana value, you may cast it without paying its mana cost.

Untap up to X permanents you control during each other player's untap step, where X is the number of Shrines you control.

Flash
Whenever you cast Siflir, Elder Pawn or another spell, if you paid an alternate or additional cost to cast it, draw a card.
Wander {3}{U}{U}

Choose up to one for each color among green, white, and blue among permanents you control.
• Put two +1/+1 counters on target creature.
• Target player draws a card for each creature they control with a counter on it.
• Untap all nonland permanents target player controls.

Exile target nonland permanent with mana value less than or equal to the amount of life you've lost this turn.

Flying, trample, lifelink
Ward—Pay 7 life.

Vigilance
Whenever a creature token you control deals combat damage to a player, draw a card.

Whenever a token you control enters, put a +1/+1, flying, haste, trample, vigilance, or loyalty counter on a permanent you control other than Simul.
[+1]: Create a 1/1 green Plant creature token.
[–2]: Create a blue Aura enchantment token with enchant permanent and “When enchanted permanent dies, you draw two cards.”
[–5]: Create a 3/3 green, blue, and red Dragon creature token with flying. For each kind of counter on permanents you control, you may put a counter of that kind on it.

Exile target creature or enchantment if its mana value is less than or equal to the number of spells named Singularity you've cast this game.

I — Siphon the Divine gains “Creatures your opponents control lose hexproof and indestructible and can't have or gain hexproof and indestructible.”
II — Target creature you control fights up to one target creature.
III — Exile target player's graveyard.

Trample
Whenever Skittertiller deals combat damage to a player, put a +1/+1 counter on it.

Whenever you cast a green spell, choose up to X, where X is the number of green mana symbols in that spell's mana cost —
• Create a 1/1 white Human creature token.
• Put a +1/+1 counter on a creature you control.
• Put a trample counter, vigilance counter, or a reach counter on a creature you control.
• Untap target land.

Trample
Whenever another creature you control becomes the target of a spell you control, create a token that's a copy of that creature, except it has haste. Sacrifice that token at the beginning of the next end step.

{T}: Add {C}.
{3}, {T}: Create a 1/1 white Golem creature token. Spend mana of three different colors to activate this ability.
{T}: Put a +1/+1 counter on target creature. It gains flying until end of turn. Activate only as a sorcery and only if you control ten or more permanents.

Flying
Favored
Whenever another legendary nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of it, except it has no name, it isn't legendary, and it is a Zombie.

Lifelink
Whenever this creature or another creature you control enters, if it entered from a graveyard or was cast from a graveyard, put two exalted counters on it.