It's just that with the old rule, you could cast Azusa, then drop your two additional lands of the turn, then if you did bounce+replay or blink your Azusa in the same turn you could play two more additional lands. Which happens in 0,0000001% of the games.
It still works that way under the new rules. What's changed now is that if you play Azusa, drop two lands, then sac it, you can't play a third. Effectively, you're forced to use your default land drop before you can take advantage of bonus drops.
If you have 5 or fewer life, you may cast Desperate Tactics without paying its mana cost.
Desperate Tactics deals 2 damage to target creature or player.
It still works that way under the new rules. What's changed now is that if you play Azusa, drop two lands, then sac it, you can't play a third. Effectively, you're forced to use your default land drop before you can take advantage of bonus drops.
Instant
If you have 5 or fewer life, you may cast Desperate Tactics without paying its mana cost.
Desperate Tactics deals 2 damage to target creature or player.
Next: Suspension of Disbelief
Land
T: Add 1 to your mana pool.
T: Add one mana of any color among permanents you control to your mana pool.
Next - Acid Rain
Artifact - Equipment
Wither
Equipped creature get +3/+3.
At the beginning of your upkeep, Grafted Wargear deals 1 damage to equipped creature.
Equip 1
Next - Snuff Out
Creature - Spirit
3/3
Changeling
Whenever a card is removed form the game from anywhere, you may put a +1/+1 counter on That Which Was Lost.
Next - Time Out
Artifact
When ~ comes into play, put a token copy into play that loses this ability.
,Q: Tap two other target nonland permanents.
Next: Cat's Grace
Creature - Giant
4/4
Reach
Bunding Skyfisher can't be blocked by creatures without flying.
Next: 3BB
Instant
Regenerate any number of attacking creatures. If a creature is regenerated this way, untap it.
Next: Spellbook
Instant - Arcane
Shuffle target spell with converted mana cost X and Spiraling for Infinite into their owners' libraries.
Draw a card.
Next: Bull's Strength
Sorcery
Choose a card type, then target player discards a card. If the discarded card isn't the chosen type, that player loses 3 life.
Next: 2RRGG
Artifact
(2/W),T: Prevent the next 3 damage that would be dealt to target creature or player this turn.
Next: Heartseeker
Creature - Angel
2/2
Flying
If a player would pay less than a spell's mana cost to play that spell, he or she pays its mana cost instead
Next: Sleep
Creature - Human Spellshaper
1/1
W,T, Discard a card: Counter target spell unless its controller pays an additional 1.
"Your money's no good here."
Next: Replenish