Landfall — Whenever a land you control enters, Pitfall Pincher deals 1 damage to any target. If that target is a creature, it blocks this turn if able.

Amity — When you cast this spell, copy it if you attacked with exactly two creatures this turn. You may choose new targets for the copy.
Target creature gets +0/+2 and gains hexproof until end of turn.

Enchant nonland permanent
Whenever a nonland permanent you control enters, if its mana value is greater than enchanted permanent's, exile enchanted permanent.

When Plasma Armory enters or leaves the battlefield, create a Weapon token.
{2}, Sacrifice Plasma Armory: Draw a card.

When Plasma Elite enters, create two Weapon tokens, then attach them to Plasma Elite.

Flying, haste
When Plasmana Hellkite enters, it deals 2 damage to any target and 1 damage to any other target.

Return a land you control to its owner's hand: Plated Tunneler gets +1/+0 and gains menace until end of turn.

When Player Band enters, create a 2/3 colorless Bard creature token, then attach Player Band to it.
Equipped creature gets +1/+1.
{1}, Unattach Player Band: Tap equipped creature. It gains hexproof until end of turn.
Equip {3}

Each player mills two cards. When you do, return target creature card from your graveyard to your hand.

Landfall — Whenever a land you control enters, Plucky Trainer gets +2/+2 until end of turn.

Once each turn, when you activate a creature, you may create a tapped token that's a copy of it, except it's a 1/1 Toy in addition to its other types and it isn't legendary.

Poised Flame deals 2 damage to any target.
Add {R}{R}. You can't spend this mana to cast spells.

When Poisoned Rose enters, create a Berry token.
{B}, Sacrifice a Berry: Target creature gets -1/-1 until end of turn. You can't activate this ability during combat.

Poisoned Strike deals 3 damage to target creature. That creature's controller mills three cards.

Defender
Approval — Political Prisoner can attack as though it didn't have defender as long as the number of colors among permanents you control is greater than the number of colors among permanents defending player controls.

When Pollen Warning enters, create a 1/1 green Plant creature token, then put a +1/+1 counter on a creature you control.

Choose target nonland permanent you control and up to two target nonland permanents you don't control. Return those permanents to their owner's hands.

Possibility Heights enters tapped.
{T}: Add {R} or {G}.
{T}, Discard another card named Possibility Heights: Draw a card.

Noncreature spells you cast cost {1} less to cast.

Flying
When Powerline Warbler enters, return target artifact card from your graveyard to your hand.

When Practicing Guru enters, create a Berry token.
Practicing Guru gets +1/+1 as long as you've sacrificed a Berry that was attached to it this turn.
Sacrifice a Berry attached to Practicing Guru: It gains indestructible until end of turn.

Until end of turn, target creature gains “When this creature dies, return it to the battlefield tapped under its owner's control and teach it flying.”

Flying, haste
Landfall — Whenever a land you control enters, put a +1/+1 counter on Pressuring Ghoul unless any opponent discards a card.

{T}: Add {C}.
{3}, {T}, Sacrifice Prickly Dunes: Create two 1/1 green Plant creature tokens. Activate only as a sorcery.