First printed in Shadowmoor (2008)
Leech Bonder 

Creature — Merfolk Soldier
This creature enters with two -1/-1 counters on it.,
: Move a counter from target creature onto a second target creature. (
is the untap symbol.)
In the last 30 days 0.7% of Commander decks played it (40 of 6150). Most played in Kinnan, Bonder Prodigy.
Combos
107 combos from Commander Spellbook, the most popular first.
- Infinite colored mana, Put most creature cards from your library onto the battlefield: Cryptolith Rite + Kinnan, Bonder Prodigy + Leech Bonder
- Infinite colored mana, Put most creature cards from your library onto the battlefield: Kinnan, Bonder Prodigy + Leech Bonder + Paradise Mantle
- Infinite creature tokens, Infinite creature ETB: Cryptolith Rite + Deeproot Pilgrimage + Leech Bonder
- Infinite colored mana: Cryptolith Rite + Leech Bonder + Nyxbloom Ancient
- Infinite +1/+1 counters on creatures you control: Cryptolith Rite + Hardened Scales + Leech Bonder
- Infinite creature tokens, Infinite creature ETB: Deeproot Pilgrimage + Leech Bonder + Paradise Mantle
- Infinite colored mana, Return most creature cards from your graveyard onto the battlefield: Kinnan, Bonder Prodigy + Leech Bonder + Song of Freyalise
- Infinite +1/+1 counters on creatures you control: Branching Evolution + Cryptolith Rite + Leech Bonder
- Infinite proliferate: Cryptolith Rite + Doubling Season + Leech Bonder
- Infinite looting, Infinite self-discard triggers…: Benthic Biomancer + Cryptolith Rite + Leech Bonder + Thassa's Oracle
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Legal
- Legacy Legal
- Vintage Legal
- Pauper Not legal
- Future Standard Not legal
- Historic Not legal
- Timeless Not legal
- Alchemy Not legal
- Penny Dreadful Legal
- Premodern Not legal
- Old School 93/94 Not legal
Singleton
- Gladiator Not legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Not legal
- PreDH Legal
- Tiny Leaders Legal
- Oathbreaker Legal
- Brawl Not legal
- Standard Brawl Not legal
- Competitive Brawl Not legal