Yeah, this ability made sense in MH1 with cycling... outside of Opt I've yet to see a single card that would make this "second card" mechanic viable in limited in any way.
First Dragon Storm-Grab Lathliss, Dragon Queen
Second Dragon Storm-Grab Scourge of Valkas, both Scourge and lathliss Trigger, put lathliss trigger second. 3 dmg from scouge.
Third Dragon Storm- Grab Scourge, token enters first again, 2 scourge triggers 5 dmg each. Total 17 damage so far.
This version needs more than 3 storm counters to win.
Scourge + Scourge + Bogardan Hellkite is 21 damage with 3 storm (without combat phase).
Bogardan Hellkite+ Karrthus, Tyrant of Jund is 17 dmg with 2 storm (and with 3 storm is gg).
Also Rite of Flame and Gitaxian probe are banned in modern and probe is banned in Legacy and even restricted in Vintage.
If you don't care about what format this deck is legal to play with, you can add 4 Lotus Petal for extra speed.
2
In common so far we have Tome Raider, Witching Well (the best ones imo), Merchant of the Vale, Opt and Golden Egg
1
First Dragon Storm-Grab Lathliss, Dragon Queen
Second Dragon Storm-Grab Scourge of Valkas, both Scourge and lathliss Trigger, put lathliss trigger second. 3 dmg from scouge.
Third Dragon Storm- Grab Scourge, token enters first again, 2 scourge triggers 5 dmg each. Total 17 damage so far.
This version needs more than 3 storm counters to win.
Scourge + Scourge + Bogardan Hellkite is 21 damage with 3 storm (without combat phase).
Bogardan Hellkite+ Karrthus, Tyrant of Jund is 17 dmg with 2 storm (and with 3 storm is gg).
Also Rite of Flame and Gitaxian probe are banned in modern and probe is banned in Legacy and even restricted in Vintage.
If you don't care about what format this deck is legal to play with, you can add 4 Lotus Petal for extra speed.