Flash
When Permafrost Tiger enters the battlefield, you may have it fight target creature that entered the battlefield this turn.

Trample, ward {3}
Other Yetis you control get +1/+1.
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, create a 3/3 green Yeti creature token with trample.

Target creature you control gets +1/+1 until end of turn. Prevent all combat damage that other creatures would deal this turn.

When Reaching Remnant enters the battlefield, it deals 4 damage to target creature with flying you don't control.
Spellcharge 3

Mill a card. Put a +1/+1 counter on up to one target creature. Exile up to one target card from a graveyard. You gain 1 life.
Flashback {1}{G}

Choose one —
• Destroy target artifact.
• Destroy target enchantment.
• Exile target card from a graveyard.

Put two +1/+1 counters on target creature you control. It fights up to one target creature an opponent controls. You gain 4 life.

Reach
When Roaming Treefolk enters the battlefield, target creature or Ruin gets +2/+2 until end of turn.
Wander {5}{G}

When Rotroot Hauler enters the battlefield, mill three cards, then you may put a permanent card in your graveyard on top of your library.

Double target creature's power and toughness until end of turn.
Flashback {1}{G}

When Seer of the Aspirants enters the battlefield, surveil 1.
Wander {2}{G}

When Slumbering Grove enters the battlefield, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Spellcharge 8

Create a 1/1 green Saproling creature token for each permanent card you own in your graveyard and in exile.
Flashback {2}{G}{G}

Target creature gets +3/+3 until end of turn. If the total number of land cards you own in exile, in your graveyard, and on the battlefield is at least seven, it gets +5/+5 instead, then untap it.

Haste
When Summoning Swords enters the battlefield, search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.
Spellcharge 7

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.

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

Enchant artifact or land
Enchanted permanent has “{T}: Add one mana of any color.”
Whenever enchanted permanent becomes a creature, untap it.
Wander {2}{G}

At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, creatures you control get +1/+1 and gain trample until end of turn.

Choose creature or land. Reveal the top four cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest into your graveyard.

Abominable Avalanche deals 3 damage divided as you choose among one, two, or three targets.
At the beginning of your end step, if you've spent at least five mana to cast spells this turn, you may exile Abominable Avalanche from your graveyard. If you do, create a 3/3 green Yeti creature token with trample.

Alranta Portalmage can't be blocked as long as a creature you control entered the battlefield this turn.
If a creature you control entering the battlefield would cause an ability of a permanent you control to trigger, that ability triggers an additional time.

Whenever Ancient Conscriptor becomes spellcharged, gain control of target creature you don't control until end of turn. Untap it. It gains haste until end of turn.
Spellcharge 4

Flash
When Blind Keelah enters the battlefield and whenever you cast a spell during an opponent's turn, each opponent loses 1 life and you surveil 1. This ability triggers only once each turn.

Flying, haste
When Blistering Cryophoenix enters the battlefield, discard any number of cards, then draw that many cards.
If a spell you own which had its flashback cost paid would be put into exile, put it into your hand instead.