While slowing down your opponents is great, it's Authority of the Consuls' lifegain trigger that excites me the most
Love reading or hearing me yap about TCGs
The standout though is definitely Iono, which equalized the playing field by punishing decks that cant close out the game fast enough

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(You can only gain this effect twice per turn.) ATK/ 0 DEF/ 500 Active Guard EARTH Lv 4 Machine/Armor/Effect You can only control 1 "Active Guard"
Enchantment and Artifact Removal Ancient Grudge Disenchant Revoke Existence The effect is generally pegged at Disenchantefficient, instant speed, one-for-one at two mana