If you combine this card with AM, you have a pretty fast attacker that can break almost any stall.
This statement is FALSE. Antimatter is instantly reapplied to
any singularity with a positive attack value, making any attempt to boost its stats as an offensive creature useless. In addition, it can and WILL apply effects such as 'Vampire' and 'Adrenaline' to itself after becoming immaterial, making it a monster to deal with once you generate it.
It can also grant the opponent 'Nova', copy itself via 'Infest' OR 'Parallel Universe', and on top of it all off, can further lower its ATK by using an inverted form of Chaos Power on itself (Singularities (upped) went from -7 to -12 in a turn for example).
...about damn time this card was nerfed. Bless all those precious SNbows goodbye folks. Spells are getting hit left and right here...