There are so many things that Ash Blossom & Joyous Spring hits, making it such a good staple
Everything about this artwork works from the pale blue glow surrounding the water scene to the light pink flowers drifting by, to Dragonairs own serene form looking up in amazement
The strategy consists in the "Danger!" monsters revealing themselves in their owner's hand to activate their effects, then "hiding" in the hand again, making the opponent randomly discard a card from their opponent's hand
A creature that gets -1/-1 won't get an additional -2/-2 if it later becomes green and/or white
When Underworld Goddess is link summoned, the summoner can negate the effects of all special summoned monsters on the opponent's side of the field
This is, perhaps surprisingly, a new archetype for mono-white in EDH, where Voltron strategies have largely been aura and equipment based, all the way back to Sram, Senior Edificer