Whenever one or more creature cards are put into your graveyard from anywhere, you may choose one and pay {X}, where X is the chosen card's mana value. If you do, create a tapped token that's a copy of it.
{T}: Target player mills two cards.

I — Draw two cards.
II — Return all nonland, nonenchantment permanents to their owners' hands.
III — You may cast a non-Saga spell with mana value 5 or less from your hand without paying its mana cost.

When The Smoking Strand enters, you may search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.
Planeswalkers you control have “+1: Draw a card.”

Decayed
You may cast The Venerable Veteran from your graveyard.

[–1]: Create a red and green Subroutine enchantment token named SAVE with “Whenever this Subroutine runs, exile the top card of your library. You may play it this turn.”
[–1]: You may sacrifice an enchantment. If you do, search your library for an enchantment card with mana value equal to 1 plus the sacrificed enchantment's mana value, put it onto the battlefield, then shuffle.

Tap all permanents.
Exile The World Stood Still.

Draw a card if a creature you control has flying. Do the same for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

This land enters tapped unless you control one or fewer other lands.
{T}: Add {G} or {W}.
Cycling {2}

When Thoveus Adi dies, put him into his owner's library third from the top.
[+1]: At the beginning of your next upkeep, draw a card.
[–3]: At the beginning of target opponent's next end step, that player sacrifices two creatures.
[–8]: When you next cast a Thoveus spell, take two extra turns after this one.

Flying, haste
Instant and sorcery spells cost {2} less to cast.
Whenever an opponent casts their second spell each turn, create a 5/5 red Dragon enchantment creature token with flying.

Ninjutsu {1}{U}
If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.

Sacrifice each creature you control. Each opponent sacrifices that many creatures. Draw a card for each creature that's died this turn.

Choose one —
• Target creature you control deals damage equal to twice its power to target creature or planeswalker you don't control.
• Destroy each artifact or enchantment with mana value less than or equal to the power of target creature you control.

Choose up to one for each color among white, blue, and black among permanents you control.
• Return target artifact or enchantment card from your graveyard to your hand.
• Return target instant or sorcery card from your graveyard to your hand.
• Return target creature or planeswalker card from your graveyard to your hand.
Exile Tiril Agenda.

Ward {2}
Whenever an enchantment you control enters, put a +1/+1 counter on Tiro, the Silent Blade.

Titan's Stairs enters tapped.
{T}: Add {R} or {W}.
{3}{R/W}: Titan's Stairs becomes a 2/2 red and white Archon creature with flying until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to red and white. Activate only once each turn.

Equipped creature gets +2/+0 and has protection from permanents and spells with greater mana value than itself. This effect doesn't remove Titansbane.
Equip {2}{W}

At the beginning of each player's upkeep, that player discards a card or sacrifices a nontoken, nonland permanent. If Tithe to the Machine was sacrificed this way, create a 2/2 black Zombie artifact creature token for each card type among cards integrated onto it. Otherwise, integrate that card.

Tap another untapped creature you control: Toki gets +1/+1 until end of turn. If that creature had flying, Toki gains flying until end of turn. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Activate only as a sorcery.

Spend only mana of different colors to cast this spell.
For each color among permanents you control, the first multicolored spell you cast each turn costs one mana of that color less to cast. This effect reduces only the amount of colored mana you pay.

This land enters tapped unless you control one or fewer other lands.
{T}: Add {R} or {W}.
Cycling {2}

When Totemic Guidestones enters, draw a card.
Creature spells you cast cost {1} less to cast.
You may cast creature spells as though they had flash.

When Towering Sentinel enters, for each kind of counter among permanents you control, put a counter of that kind on Towering Sentinel, then add {G} or {U}.

The first spell you cast each turn costs {2} less to cast.
The second spell you cast each turn can't be countered.
Whenever you cast your third spell each turn, draw a card.

Ninjutsu {1}{G}{U}
As long as Tsubasa Shigane entered during combat this turn, he's a 4/4 Ninja creature with hexproof and you may activate his loyalty abilities any time you could cast an instant.
[+1]: Up to one other target creature gains indestructible until end of turn.
[–1]: Double another target creature's power until end of turn.
[–2]: Return target creature to its owner's hand.