Ironhoof Ox can't be blocked by more than one creature.

You may have Lone Wolf assign its combat damage as though it weren't blocked.

When Man-o'-War enters the battlefield, return target creature to its owner's hand.

Manta Ray can't attack unless defending player controls an Island.
Manta Ray can't be blocked except by blue creatures.
When you control no Islands, sacrifice Manta Ray.

Target creature gets +2/+2 until end of turn. If you cast this spell during your main phase, that creature gets +4/+4 until end of turn instead.

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

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Enchant creature
Enchanted creature has flying.
Sacrifice Phantom Wings: Return enchanted creature to its owner's hand.

Shuffle all creature cards from target player's graveyard into that player's library.
Cycling (, Discard this card: Draw a card.)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Roc Hatchling enters the battlefield with four shell counters on it.
At the beginning of your upkeep, remove a shell counter from Roc Hatchling.
As long as Roc Hatchling has no shell counters on it, it gets +3/+2 and has flying.

Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)

Flying
: Regenerate Screeching Harpy.

Flying (This creature can't be blocked except by creatures with flying or reach.)

When Striped Bears enters the battlefield, draw a card.

Flying
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
Whenever Teferi's Imp phases out, discard a card.
Whenever Teferi's Imp phases in, draw a card.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever Thieving Magpie deals damage to an opponent, draw a card.

Reach (This creature can block creatures with flying.)

Trample
When Uktabi Kong enters the battlefield, destroy all artifacts.
Tap two untapped Apes you control: Create a 1/1 green Ape creature token.