Whenever an opponent taps a land for mana, tap all lands that player controls. If a creature an opponent controls attacks, all creatures that opponent controls attack if able.
Razia, archangel of war, demands total commitment.
When Whiptail Moloch enters the battlefield, it deals 3 damage to target creature you control.
"It wags its tail when it's happy. It wags its tail when it's angry. Nope, there's no good time to be around a whiptail." —Rugar, Leaguehall Infirmary patient
Graft 4 When Cytoplast Root-Kin enters the battlefield, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it. {2}: Move a +1/+1 counter from target creature you control onto Cytoplast Root-Kin.
Choose a card type. Target opponent reveals their hand. Create two 1/1 green Saproling creature tokens for each card of the chosen type revealed this way.
Cast this spell only during combat after blockers are declared. Create a 1/1 green Saproling creature token that's blocking target creature attacking you. Draw a card.
"This undemanding vegetation takes root in a mote of dust but grows incredibly quickly." —Simic research notes
When Indrik Stomphowler enters the battlefield, destroy target artifact or enchantment.
"An indrik's howl has destructive power much subtler than that of its crushing foot. The sound is mundane, but inaudible vibrations scatter and sunder magical contrivances." —Simic research notes
Flying When Patagia Viper enters the battlefield, create two 1/1 green and blue Snake creature tokens. When Patagia Viper enters the battlefield, sacrifice it unless {U} was spent to cast it.
When Protean Hulk dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle.
Graft 3 {1}{G}: Until end of turn, target creature with a +1/+1 counter on it gains "Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."
"Infused with autochthon blood for size and hellion cells for speed, the ragworm is perfect for clearing the undergardens of both rats and vagrants." —Yolov, Simic bioengineer
Enchant Forest As Utopia Sprawl enters the battlefield, choose a color. Whenever enchanted Forest is tapped for mana, its controller adds an additional one mana of the chosen color.
{G}, Sacrifice Verdant Eidolon: Add three mana of any one color. Whenever you cast a multicolored spell, you may return Verdant Eidolon from your graveyard to your hand.