In a format with few board-wipes and an abundance of one-for-one removal spells, Virtuoso and Bristling Hydra are the spells to beat
#18: Elesh Norn, Grand Cenobite Number eighteen on our list may come as a surprise to some, but those people probably havent had to face down enough Elesh Nornsyet
Of course, they couldnt just do a color-shifted version of Counterspell in black, since that would be too strong
If a card has an oval security stamp (or no security stamp at lower rarities), it's legal in Eternal formats (which includes Commander, Legacy, and Vintage)
The obvious tutor targets for Tiamat include Terror of the Peaks , Miirym , Lathliss , Scourge of Valkas , and Stormscale Dragon to pile on damage in one shot