Mill two cards, then return a creature card from your graveyard to your hand.
Surface {3}{B}

Target creature can't be blocked this turn. If this spell's flashback cost was paid, put a +1/+1 counter on that creature.
Flashback {1}{U}

You gain 4 life. If this spell's flashback cost was paid, draw a card.
Flashback {3}{W}

Choose one —
• Walk the Dead's Path deals 3 damage to target attacking or blocking creature.
• Destroy target enchantment.

Target creature gets +4/-2 until end of turn.

{T}, Sacrifice Warpway Rings: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{T}: Target land you control becomes the basic land type of your choice until end of turn.
{2}{U}, {T}: Draw a card, then discard a card. This ability costs {2} less to activate if you control four or more lands with different names.

{T}: Add {C}.
{T}: Add one mana of any color. If you don't control a Weather, spend this mana only to cast a Weather spell.

Reveal the top three cards of your library. You may put a creature, enchantment, or land card from among them into your hand and the rest on the bottom of your library in any order.

{1}, {T}: Target permanent you control becomes an artifact in addition to its other types until end of turn.
Sacrifice Welding Rig: Target artifact gains indestructible until end of turn.

You may cast this spell as though it had flash if you activated a nonmana ability this turn.
Target artifact or creature's owner puts it on their choice of the top or bottom of their library.

Create X 1/1 white Insect creature tokens with flying.
Flashback—{3}{W}{W}, Tap X untapped creatures you control.

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.

Tap up to one target creature. Creatures you don't control don't untap during their controllers' next untap step.
Flashback {4}{U}

Target player separates all nonland permanents they control into two piles. That player sacrifices all permanents in the pile of your choice.

Choose one —
• Wyrmshot deals 3 damage divided as you choose among one, two, or three targets.
• Wyrmshot deals 6 damage to target creature, planeswalker, or battle.

[+2]: Mill three cards. You gain 3 life.
[+1]: Return target land card from your graveyard to the battlefield. It becomes a 2/2 black Zombie creature in addition to its other types.
[–2]: Target opponent sacrifices a nonland permanent with mana value 3 or greater.
[–12]: You get an emblem with “Whenever a player sacrifices a permanent, you may draw a card.” Then each opponent sacrifices five permanents.

Integrate up to two target creatures with total toughness 6 or less.

Xiv, Replisparked has all abilities of creature and planeswalker cards integrated onto them.
[+2]: Target player discards a card. Integrate up to two cards from graveyards.
[+1]: Xiv becomes a 5/5 artifact creature with vigilance and indestructible until end of turn.
[–4]: Integrate target permanent.

Whenever Zakros Decree or another enchantment you control enters, target creature you control gets +1/+1 and gains lifelink until end of turn.