Double strike
Whenever you attack, mill two cards. For each of the milled cards, you may cast it, then if you don't, creatures you control get +1/+0 until end of turn.

Choose one. If your devotion to red is three or greater, you may choose another. The same is true for devotion to white.
• Create four 1/1 white Human creature tokens.
• Creatures you control get +1/+1 and gain haste until end of turn.
• Opponents can't cast spells or activate abilities that aren't mana abilities this turn.

Indestructible
As long as your devotion to red and white is less than seven, Iroas isn't a creature.
Whenever you attack, you gain 1 life for each attacking creature. If you gained 5 or more life this way, draw a card.

Vigilance, trample
{2}{R}{W}: Any number of target creatures you control have base power and toughness 6/6 until end of turn.

When Ironback Tyke enters, you may search your library for a basic Mountain or Plains card, reveal it, put it into your hand, then shuffle.
{2}{R}{W}: Any number of target creatures you control have base power and toughness 3/3 until end of turn. If you control seven or more permanents with activated abilities, transform Ironback Tyke. Activate only as a sorcery.

Karda's Emmisary is a 5/5 Illusion enchantment creature as long as you control three or more enchantments.

Whenever an opponent gains life or draws a card during your turn, you do the same.
[+1]: You may discard a card. If you do, each player may draw a card.
[+1]: For each player, up to one target creature they control gains vigilance and lifelink until end of turn.
[–7]: Choose a card type. Each opponent who controls more permanents of that type than you sacrifices a number equal to the difference.

Choose one —
• Target attacking creature you control gets +1/+1 until end of turn for each creature you control.
• Choose target creature you control. Create a number of 1/1 white Human creature tokens equal to that creature's power.
Flashback {3}{R}{W}

Flash
Lifelink
When Nikon, Skophos Protector enters, the next time a source of your choice would deal damage to you or a permanent you control this turn, prevent that damage. If damage is prevented this way, Nikon deals that much damage to that source's controller.

Cast this spell only during combat.
Untap all attacking creatures and tap all blocking creatures. After this phase, there is an additional combat phase.

At the beginning of combat on your turn, target creature or Shrine you control gains first strike until end of turn. If you control three or more Shrines, it gains double strike until end of turn instead.

Trailblazer Anarch has first strike as long as it's your turn.

At the beginning of your upkeep, create a 1/1 red Fan creature token. Then if you control two or more Fans, create another one of those tokens. Then if you control five or more Fans, Underground Sensation deals 2 damage to any target and you gain 2 life.
{3}{R}{W}: Create a 1/1 red Fan creature token.

Whenever you cast a spell that targets Zenith Marshal, create a 1/1 white Human creature token. If Zenith Marshal is attacking, that token enters tapped and attacking.
As long as Zenith Marshal is attacking, other creatures you control get +1/+0.

Spells you cast from anywhere other than your hand can't be countered.
{1}{G/U}, {T}: Put a +1/+1 counter on target creature that doesn't have a +1/+1 counter on it. Activate only as a sorcery.

Brass Laborer enters with two reach counters on it.

Once each turn, when Carefree Kappa enters or becomes the target of a spell or ability, you may create a Weather enchantment token that's all colors named Looks Like Rain with “Whenever you attack, you gain 1 life.”
Carefree Kappa gets +1/+1 for each Weather you control.

When Cryptolabe enters, exile your hand and the top card of your library. You may play cards exiled this way for as long as they remain exiled.
{T}: Add {G}{U}. This mana can't be spent to cast spells from your hand.

Ward {2}
At the beginning of your upkeep, put a +1/+1 counter on Decavolt Reactor.

Create a 1/1 colorless Construct artifact creature token, then put a +1/+1 counter on each Construct you control.

You gain 3 life, scry 2, then draw a card.

Create a tapped Leyshard token.

Ward {2}
Imposing Serpent enters with X +1/+1 counters on it.

Whenever Kaleidoscope Mage attacks, look at the top three cards of your library. You may put any number of land cards with different names from among them onto the battlefield tapped. Put the rest on the bottom in a random order.

Choose one. If your devotion to green is three or greater, you may choose another. The same is true for devotion to blue.
• Create two tapped tokens that are a copy of a land you control.
• Draw three cards.
• Untap up to three lands you control.