While putting a Shield counter on another creature is a recent innovation from Streets of New Capenna that the blue, green, and white Brokers faction specialized in, giving creatures Hexproof and other protective abilities is something Simic does very well
It's hard not to get tremendous value out of Underworld Breach
Assuming your opponents all have one poison counter, the minimum amount of mana needed is 10 thanks to inexpensive spells like Contentious Plan, Unnatural Restoration, and Experimental Augury
Blink decks, also known as flicker decks, aim to use effects that exile their own permanents, then returning them to the battlefield in order to repeatedly reap the benefits of powerful enter the battlefield triggers
This Gruul commander ramps you by making all your artifact tokens tap for 1 more mana than they did before, which means that Treasure is a natural fit
Invasion of Segovia Invasion of Segovia is another battle that really needs to transform for you to get the most out of it