Equipped creature gets +2/+2 and can't be blocked by more than one creature.
Equip {4}

Enchant permanent
Enchanted permanent can't attack, block, or wander.

Choose target card in a graveyard other than a basic land. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. If their library is searched this way, they shuffle it. You gain 1 life for each card exiled this way. That player draws a card for each card exiled from their hand this way.
Flashback {3}{B}

Fortress Arena enters tapped.
{T}: Add {R} or {W}.
{2}{R}{W}, {T}, Sacrifice Fortress Arena: Draw a card.

Create a tapped Leyshard token.

When Free Market enters, target creature gets +2/+2 until end of turn.
You control a creature with power 4 or greater.
You control a creature with toughness 4 or greater.

Whenever you attack, create a 1/1 colorless Soldier creature token that's tapped and attacking.

Exile target creature you control, then return that card to the battlefield under its owner's control.

Create three Berry tokens, then sacrifice any number of Berries. For each Berry sacrificed this way, creatures you control get +1/+1 until end of turn.

Frequency Jolt deals 5 damage to target creature, then it deals 2 damage to that creature's controller for each time you've amped it up this turn.

Frigid Highlands enters tapped unless you control an Island.
{T}: Add {R} or {G}.

Search your library for a basic land card, put it onto the battlefield, then shuffle.

Target creature you control gains double strike until end of turn. It deals damage equal to its power to each of up to two other targets.

Enchant creature
Enchanted creature attacks each combat if able.
Whenever enchanted creature attacks, teach it trample.

Put a +1/+1 counter on target creature, then it gets your choice of +1/+1 or lifelink until end of turn.

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast Shrine spells or activate abilities of Shrines.

[+1]: Discard up to two cards, then draw that many cards.
[–1]: You may sacrifice a creature. When you do, return target creature card with equal or lesser mana value from your graveyard to the battlefield tapped.
[–2]: You may exile a creature card from your graveyard. When you do, Garren deals damage equal to the exiled creature's power to target creature.

Gates to the Underworld enters tapped.
{T}: Add {W} or {B}.
{5}{W/B}: Gates to the Underworld becomes a 3/4 white and black Construct creature with lifelink until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to white and black. Activate only once each turn.

You may look at the top card of your library any time.
Approval — Once during each of your turns, you may cast a spell with mana value less than or equal to the number of colors among permanents you control from your hand or the top of your library without paying its mana cost.

Choose one —
• Destroy target artifact.
• Target attacking creature gets +3/+3 until end of turn.

Whenever a creature you control enters, teach it flying if a creature you control has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Exile target spell you don't control. After this turn has ended, its owner may cast that card from exile by discarding a card in addition to paying its other costs.

[+1]: Up to one target creature gets +2/+0 and gains haste until end of turn.
[–1]: Add {R}. If Gericho, Ageless Wanderer entered this turn, add {R}{R} instead.
[0]: Exile Gericho and the top X cards of your library, where X is the number of loyalty counters on him. You may play cards exiled this way until the end of your next turn.

Search your library for a noncreature, nonland card not named Get Your Wish, reveal it, put it into your hand, then shuffle.
You may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of colors among nontoken permanents you control.