The Gitrog Monster

Oracle Text
Deathtouch
At the beginning of your upkeep, sacrifice The Gitrog Monster unless you sacrifice a land.
You may play an additional land on each of your turns.
Whenever one or more land cards are put into your graveyard from anywhere, draw a card.
Card Rulings
4/8/2016 If multiple land cards are put into your graveyard at once, The Gitrog Monster’s last ability triggers only once. This could happen because an effect (such as that of Crawling Sensation’s first ability) put them there from your library at once, or because they were destroyed at the same time (such as two land creatures that were dealt lethal combat damage).
You're right. Then we need a Sultai frog overlord!
And curiously, there is a madness-enabler frog with white. So I see no reason why the next commander product shouldn't have a four-coloured WUBG frog legend.
life from the loam
Bonkers with magmatic insight and borbyrgmos !!! Jund!!!