This spell has flash as long as you have at least 3 life more than your starting life total.
Flying

When Taiga Bonder enters, put a +1/+1 counter on target creature.
Wander {3}{W}{W}

Menace
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, put two +1/+1 counters on Terror of Whitecliff Pass.

{T}: Add {C}.
Spellcharge 4

Defender, trample
At the beginning of combat on your turn, if you have at least 3 life more than than your starting life total, Thawing Yeti loses defender until end of turn. Otherwise, you gain 2 life.

Draw three cards. Then discard two cards unless you discard a card with flashback.
Flashback {6}{U}{U}

When Thornlasher Mortis enters, mill two cards.
Whenever one or more cards leave your graveyard, create a 1/1 green Saproling creature token. This ability triggers only once each turn.

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.

Whenever a creature or land you control enters, you gain 1 life.
Creatures you control get +1/+1 as long as you have at least 3 life more than your starting life total.

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.

Destroy target creature. If that creature entered this turn, scry 2.

{T}: Add {C}.
{4}, {T}, Sacrifice Timeworn Crags: Destroy target nonbasic land. This ability costs {1} less to activate for each nonbasic land you don't control.

Spellcharge 2

When Tireless Aspirants enters, you may draw a card. If you do, discard a card.
Wander {1}{U}

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}

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.

Deathtouch
{T}: Add {C}.
Spellcharge 3

Exile the top three cards of your library. Choose two of them. You may play the chosen cards until the end of your next turn.

Whenever a Ruin you control becomes spellcharged, it gets +1/+0 and gains haste until end of turn.
Spellcharge 2

Indestructible
Equipped creature has indestructible as long as it's your turn.
Equip {1}
Spellcharge 5

Search your library for a card, put it into your hand, then shuffle.
Flashback—{1}{B}, Discard a card, Sacrifice a creature.

Unstable Formation enters with three charge counters on it.
{1}, {T}, Remove a charge counter from Unstable Formation: Unstable Formation deals 1 damage to target player or planeswalker. You may sacrifice Unstable Formation. If you do, draw a card.

{T}: Add {C}.
Whenever Unwavering Gates attacks, other creatures you control gain indestructible until end of turn.
Spellcharge 5

When Ursine Advocate enters, create a 2/2 green Bear creature token.

Valley Caravan's power and toughness are each equal to the number of creatures you control.
Wander {3}{W}{W}
When Valley Caravan enters, if it wandered, create a 1/1 white Human creature token.