Shaddoll falco is very good for both surviving and allowing the grind game to develop
Chevalier de Fleur X WIND Level 8 [ WarriorSynchroEffect ] ATK 2700 DEF 2300 "Fleur Synchron" + 1+ non-Tuner monsters Once per turn, during your turn, when your opponent activates a Spell/Trap Card (Quick Effect): You can negate the activation, and if you do, destroy that card
It's a huge boon when building a new deck, acting as a guideline on what cards you should add to fill out a deck or which cards to cut so you can get down to 99
It should be noted that it is difficult to handle compared to a general trump card that can ravage the field by itself
Festering Newt Ok, so you want me to pay 4 mana for a 1/3 creature, then next turn pay 2 mana to tutor out a Bubbling Cauldron, then wait another turn to tutor out a Festering Newt, then pay another mana and activate the Cauldron sacrificing Newt in order to kill a creature and drain 4 life from my opponent
In much the same way that I embraced the strange and unusual when constructing my Shattergang Brothers Eldrazi deck, Yennett gave the super gimmick weird decks a general to champion, all wrapped up in a fun sphinx