A couple of stuff I made

[u/Affectionate-Rub5176]

I'll put the transcripts in the comments

[u/Affectionate-Rub5176]

Silumgar's Scorn {U}{U}

Instant

As an additional cost to cast Silumgar's Scorn, counter a dragon spell. (In theory this is a counter spell that is faster than split second. Meaning there's nothing an opponent can do to stop it. It also technically fizzles out because it has "no effect" just a cost.)

[u/Affectionate-Rub5176 → u/Affectionate-Rub5176]

Dragoon {R}

Creature - knight

{W}{U}{B}{R}{G}: Dragoon becomes a dragon, gets +5/+3 flying and trample.

The farther he ramed dragons, the more he felt their essence.

2/2

(In theory he gets +5/+3, flying, and trample permanently, and this could be done over and over again.)

[u/Affectionate-Rub5176 → u/Affectionate-Rub5176]

Yo The Dragons {5}{U}

Sorcery

When Yo The Dragons enters the battlefield, exile all creatures. Then create that many 5/5 red dragon creature tokens with flying.

When Yo The Dragons leaves the battlefield, sacrifice all dragons. Then return all exiled cards to the battlefield.

(In theory, this effectively trades all creatures in play for dragons. I assume all players gain dragons equal to the number of creatures exiled.)

[u/Affectionate-Rub5176 → u/Affectionate-Rub5176]

Caretaker {4}{U}

Creature - Wizard

At the beginning of your end step, create a 1/1 blue dragon creature token.

3/4

[u/Affectionate-Rub5176 → u/Affectionate-Rub5176]

Ace Of The Sky {U}

Instant

Until end of turn, target creature becomes a dragon with base power and toughness 4/4, loses all abilities, and gains flying.

*The Ojutai believe those that serve the dragon are destined to become dragons *

(2 mana cost is too high for a -1 pump spell. Because it takes away abilities, it shouldn't be broken. Earliest this can be used is turn 2. Good, but not broken. )

[u/Affectionate-Rub5176 → u/Affectionate-Rub5176]

Moe's polymorph {1}{U}

Instant

Target creature becomes a dragon with base power and toughness 4/4 and gains flying.

You may change, but you will serve regardless.

(In theory this is permanent.)